JP2018094976A - Vehicle rear part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle rear part structure capable of preventing impart of a stored seat to a vehicle front.SOLUTION: A stringer 10 is provided in a position overlapped with a frame of seat back frames 22a, 22b in a vehicle width direction and includes a first stringer piece 11 being adjacent to a cross member 31 in which the thickness in the vehicle height direction is gradually reduced toward the vehicle rear side and a second stringer piece 12 being adjacent to a bumper beam 32 in which the thickness in the vehicle height direction is gradually reduced toward the vehicle front side. A vehicle rear side end part of the first stringer piece 11 and a vehicle front side end part of the second stringer piece 12 are arranged to be abutted on each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rear structure of a vehicle.

  In the following Patent Document 1, a leaf spring member is disposed on a rear side frame of a vehicle to move the occupant forward and upward in a rear collision, thereby securing a protective space for the occupant seated on the seat. Technology is disclosed.

  In Patent Document 2 below, holding means for holding the battery of the vehicle on the floor panel, and a spare tire provided adjacent to the rear portion of the battery and jumped forward of the vehicle at the time of rearward collision of the vehicle are provided above the battery. A technique for avoiding a spare tire from colliding with a battery at the time of a vehicle rear-end collision is disclosed.

JP 2013-151255 A Japanese Patent No. 4346828

  When an EV component (high voltage component) is mounted on the rear floor and a vehicle having three rows of seats is bumped rearward with the rear seat seat retracted, the rear seat seat is pushed forward of the vehicle. Contact with the EV component damages the EV component, resulting in a risk of electric leakage and fire. Therefore, a structure that avoids damage to the EV component is required.

  However, in the above Patent Documents 1 and 2, no countermeasure is taken against the rear seats stored by the rear collision being pushed forward of the vehicle.

  In view of the above technical problem, an object of the present invention is to provide a vehicle rear structure that can avoid the impact of a stored seat on the front side of the vehicle.

The vehicle rear structure according to the first invention for solving the above-mentioned problems is
A side member extending in the vehicle longitudinal direction at both ends in the vehicle width direction, a bumper beam extending in the vehicle width direction at the rear end of the vehicle, and extending in the vehicle width direction on the vehicle front side with respect to the bumper beam. A cross member fixed to the vehicle, and a seat cushion frame and a seat back frame that can be tilted by being overlapped at an angle along the longitudinal direction of the vehicle.
A vehicle rear structure that has a stringer that extends in the vehicle front-rear direction below the seat cushion frame and the seat back frame and is laid on the bumper beam and the cross member,
The stringer is provided at a position overlapping the frame of the seat back frame in the vehicle width direction, adjacent to the cross member, and a first stringer piece whose thickness in the vehicle height direction gradually decreases toward the vehicle rear side, and The second stringer piece adjacent to the bumper beam and gradually decreasing in the vehicle height direction toward the vehicle front side;
A vehicle rear side end portion of the first stringer piece and a vehicle front side end portion of the second stringer piece are arranged to face each other.

A vehicle rear portion structure according to a second invention for solving the above-described problem is
In the vehicle rear structure according to the first invention,
The cross section in the vehicle width direction of the first stringer piece and the second stringer piece is a U-shape that is open at the top.

A vehicle rear portion structure according to a third invention for solving the above-described problem is
In the vehicle rear structure according to the first or second invention,
The lowermost surface of the second stringer piece is located below the lowermost surface of the first stringer piece.

A vehicle rear structure according to a fourth invention for solving the above-described problem is
In the vehicle rear structure according to any one of the first to third aspects,
A first reinforcing member fixed so as to close an upper end surface of the opening of the first stringer piece;
And a second reinforcing member fixed so as to close the upper end surface of the opening of the second stringer piece.

A vehicle rear structure according to a fifth invention for solving the above-described problem is
In the vehicle rear structure according to the fourth invention,
The first reinforcing member and the second reinforcing member are integrally formed through a first bead.

A vehicle rear structure according to a sixth invention for solving the above-described problem is
In the vehicle rear structure according to the fourth or fifth invention,
A vehicle front end portion of the first reinforcing member is fixed to the cross member.

A vehicle rear structure according to a seventh invention for solving the above-described problem is
In the vehicle rear structure according to the sixth invention,
The first reinforcing member has a weakened portion at a position adjacent to the vehicle rear side with respect to a fixed portion between the vehicle front end portion of the first reinforcing member and the cross member.

A vehicle rear structure according to an eighth invention for solving the above-described problem is
In the vehicle rear structure according to any one of the first to seventh aspects of the invention,
A second bead is formed on the side member at a position corresponding to a position where a vehicle rear side end portion of the first stringer piece and a vehicle front side end portion of the second stringer piece abut each other in the vehicle longitudinal direction. It is characterized by that.

A vehicle rear portion structure relating to a ninth invention for solving the above-mentioned problems is as follows.
In the vehicle rear structure according to the eighth aspect of the invention,
In the lower surface of the side member, an inclined portion is formed at a position including the second bead in the vehicle front-rear direction so that the vehicle front side is inclined at an angle above the vehicle rear side.

A vehicle rear portion structure according to a tenth aspect of the present invention for solving the above problem is
In the vehicle rear structure according to any one of the first to ninth aspects,
The seat back frame protrudes downward around a position corresponding to a position where the vehicle rear side end portion of the first stringer piece and the vehicle front side end portion of the second stringer piece abut each other in the retracted state. The 1st projection part to be provided is provided, It is characterized by the above-mentioned.

A vehicle rear portion structure according to an eleventh invention for solving the above-described problem is
In the vehicle rear structure according to any one of the first to tenth aspects,
The seat back frame is provided with a second projecting portion projecting downward around a position corresponding to a position where the second bead is formed in the side member in the retracted state. .

  According to the vehicle rear structure according to the present invention, it is possible to avoid the impact of the stored seat on the front side of the vehicle.

It is a schematic perspective view which shows the vehicle rear part structure which concerns on a present Example, and its periphery. It is a schematic side view explaining the storage of a seat cushion frame and a seat back frame. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is a schematic diagram explaining the deformation | transformation at the time of the rear collision of the vehicle rear part structure which concerns on Example 1 of this invention. It is an expansion perspective view of the stringer periphery in Example 1 of this invention. FIG. 6 is an arrow view corresponding to FIG. 3 for explaining the vehicle rear portion structure relating to the second embodiment of the present invention. FIG. 5 is an arrow view corresponding to FIG. 4 for explaining a vehicle rear portion structure according to Embodiment 2 of the present invention.

  Hereinafter, a vehicle rear structure according to the present invention will be described with reference to the drawings in an embodiment. In each figure, “Fr” represents the vehicle front side, and “Rr” represents the vehicle rear side.

[Example 1]
FIG. 1 is a schematic perspective view showing a vehicle rear structure and its surroundings according to the present embodiment. FIG. 2 is a schematic side view for explaining the storage of the seat cushion frame and the seat back frame. The normal position of the rear seat 20 is indicated by a broken line, and the state where the rear seat 20 rotates to the rear side of the vehicle. It is indicated by a one-dot chain line arrow.

  In this embodiment, it is assumed that two rear seats of the vehicle are arranged in the vehicle width direction. The two rear seats include seat cushion frames 21a and 21b and seat back frames 22a and 22b, respectively, as internal structures. However, in FIG. 1, the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are indicated by broken lines.

  Further, the seat cushion frames 21a and 21b and the seat back frames 22a and 22b shown in FIG. 1 are shown rotated and stored in the vehicle rear side. In FIG. 1, the shaft that supports the seat cushion frames 21a and 21b is omitted.

  As shown in FIG. 2, the seat cushion frames 21a and 21b are rotatably supported on the vehicle rear side by a shaft 26 that extends in the vehicle width direction, and the seat back frames 22a and 22b are seat cushion frames. It can be folded to the side of 21a, 21b.

  The seat cushion frames 21a and 21b and the seat back frames 22a and 22b rotate the seat back frames 22a and 22b to the vehicle rear side with the seat back frames 22a and 22b folded to the seat cushion frames 21a and 21b, respectively. By doing so, the vehicle can be tilted and stored at an angle along the longitudinal direction of the vehicle.

  As shown in FIGS. 1 and 2, an EV component 34 is provided in the vehicle. The seat cushion frames 21a and 21b and the seat back frames 22a and 22b are positioned on the upper surface of the EV component 34 when the seat is in use. In the stored state as described above, the seat cushion frames 21a and 21b and the seat back frame 22a are positioned on the vehicle rear side of the EV component 34 and on the vehicle front side of the rear end 23 in the vehicle height direction. 22b, EV component 34, and rear end 23 partially or entirely overlap each other (located at the same height).

  Further, FIG. 1 shows a bumper beam 32 extending in the vehicle width direction at the rear end of the vehicle, a cross member extending in the vehicle width direction on the front side of the vehicle with respect to the bumper beam 32 and having both ends fixed to side members 24 and 25 described later. 31 is shown.

  The vehicle rear structure according to the present embodiment is provided at the vehicle rear as described above, and includes a stringer 10 and side members 24 and 25 as shown in FIG.

  The stringer 10 extends in the vehicle front-rear direction below the seat cushion frames 21a and 21b and the seat back frames 22a and 22b, and is installed on the bumper beam 32 and the cross member 31.

  The stringer 10 includes both the seat back frame 22a and the seat back frame 22b of the two rear seats 20 in the vehicle longitudinal direction and between the cross member 31 and the bumper beam 32 in the vehicle width direction. The first stringer piece 11 and the second stringer piece 12 extend in the vehicle front-rear direction (on the same straight line).

  As shown in FIG. 3 which is an AA arrow view of FIG. 1, the first stringer piece 11 has one side (actually a surface) adjacent to the lower surface of the rear floor 30 in the vehicle front-rear direction arrow, One side (actually a surface) is adjacent to the cross member 31, the thickness in the vehicle height direction gradually decreases toward the vehicle rear side, and the vehicle rear side end is a triangular shape with one vertex (actually a side). is there. Moreover, as shown in FIG. 1, the cross-sectional shape of the first stringer piece 11 in the vehicle width direction is a U-shape that is open at the top. However, this cross-sectional shape may be a closed cross-section (cross-sectional box shape).

  The second stringer piece 12 has one side (a part thereof) in contact with the lower surface of the rear floor 30 and the other side adjacent to the bumper beam 32 as viewed in the vehicle longitudinal direction, and the thickness in the vehicle height direction toward the vehicle front side. Is a trapezoidal shape in which the vehicle front side end is one apex. Moreover, as shown in FIG. 1, the cross-sectional shape of the second stringer piece 12 in the vehicle width direction is a U-shape that is open at the top. However, like the first stringer piece 11, the cross-sectional shape may be a closed cross-section (cross-sectional box shape).

Further, since the second stringer piece 12 extends from the rear end 23 to the bumper beam 32 on the vehicle rear side, the vehicle rear end portion is positioned below the first stringer piece 11 and at the same height as the bumper beam 32. (The lowermost surface of the second stringer piece 12 is positioned below the lowermost surface of the first stringer piece 11).

  The first stringer piece 11 (of the vehicle rear side end thereof) and the second stringer piece 12 (of the vehicle front side end thereof) are arranged on the lower surface of the rear floor 30 such that the vertices (sides) of each other in the vehicle front-rear direction are It is arranged to face each other. However, the vertices may be in contact with each other or may be separated from each other with a minute width. FIG. 3 shows a state of being separated with a minute width.

  A first plate 13 as a reinforcing member is fixed to the upper end surface of the opening of the first stringer piece 11 (between the rear floor 30) so as to close the upper end surface of the opening. A second plate 14 as a reinforcing member is fixed to the end surface (between the rear floor 30) so as to close the upper end surface of the opening.

  However, as shown in FIG. 3, the first plate 13 and the second plate 14 may be integrally formed. In this case, the bead 10 a is provided at the boundary between the first plate 13 and the second plate 14. Provide.

  Further, a third plate 15 as a reinforcing member is fixed between the second stringer piece 12 and the rear floor 30.

  FIG. 6 is an enlarged perspective view around the stringer 10. As shown in FIG. 6, the cross member 31 has a U-shape that opens upward in the cross-sectional shape in the vehicle longitudinal direction. The vehicle front side end portion 13b of the first plate 13 is fixed to the opening end surface 31a of the cross member 31 from above (by welding or bolts).

  In the first plate 13, a weakened portion 13a such as a notch may be formed at a position adjacent to the fixed portion between the vehicle front side end portion 13b and the opening end surface 31a in the vehicle front-rear direction. Further, in FIG. 6, a bead 10a protruding upward is shown.

  Further, although not shown, the third plate 15 provided on the second stringer piece 12 is similarly fixed only to the upper end side with respect to the bumper beam 32. A weakened portion such as a notch may be formed at a position adjacent to the side.

  On the other hand, as shown in FIG. 1, the side members 24 and 25 extend in the vehicle front-rear direction at both ends in the vehicle width direction, and the cross-sectional shape in the vehicle width direction is a U-shape with an upper portion opened. Although only the side member 24 will be described below, the side member 25 has the same structure.

  As shown in FIG. 4 which is a BB arrow view of FIG. 1, a bead 24 a is formed on the side surface of the side member 24. The bead 24a is located at a position where the first stringer piece 11 and the second stringer piece 12 are in contact with each other in the vehicle front-rear direction (a boundary portion between the first plate 13 and the second plate 14 (or the bead 10a)). It is formed at a position corresponding to the correspondence.

  In addition, an inclined portion 24b is formed on the lower surface of the side member 24. The inclined portion 24b is inclined at an angle such that the front side of the vehicle is positioned above the rear side of the vehicle. The inclined portion 24b is formed at a position including the bead 24a in the vehicle front-rear direction.

  Hereinafter, the deformation | transformation at the time of the rear collision of the vehicle rear part structure which concerns on a present Example is demonstrated using the schematic diagram of FIG. In FIG. 5, the seat cushion frame 21a and the seat back frame 22a in the retracted state are collectively described as a seat internal structure 41a, and some of the other structures are also omitted.

  When the bumper beam 32 moves toward the front of the vehicle as indicated by an arrow in FIG. 5 at the time of a rear collision, an impact is transmitted to the stringer 10. Then, the stringer 10 is stretched by the cross member 31 and is difficult to move to the front side of the vehicle, and the boundary portion between the first stringer piece 11 and the second stringer piece 12 which is a weakened portion (in the case of having the bead 10a described above, the bead 10). The portion 10a is bent and deformed upward.

  This boundary portion causes the rear floor 30 to be bent and deformed, so that the rear seat (the seat internal structure 41a) jumps upward. Since the seat internal structure 41a is rotatably supported (by the shaft 26) as described above, the seat internal structure 41a rotates upward (about the shaft 26). Although not shown in FIG. 5, since the stringer 10 is also applied to the seat cushion frame 21b and the seat back frame 22b side, the same operation is performed on the seat cushion frame 21b and the seat back frame 22b side.

  Thereby, in the vehicle rear part structure according to the present embodiment, it is possible to prevent the seat internal structure 41a from colliding with the EV component 34 arranged in front of the vehicle. That is, the impact of the stored seat on the front side of the vehicle can be avoided.

  In particular, if the first plate 13 and the second plate 14 are integrally formed and the bead 10a is provided at the boundary portion, the first stringer piece 11 and the second stringer piece 12 are connected to each other at the time of rear-end collision. It is possible to prevent displacement in the width direction, and as a result, it is possible to promote the upward bending of the stringer 10.

  Further, in the vehicle rear structure according to the present embodiment, the second stringer piece 12 extends to the bumper beam 32, so that the impact from the bumper beam 32 to the front of the vehicle at the time of a rear impact is a force that bends the stringer 10 upward. It becomes easy to be converted. Furthermore, since the vehicle rear side edge part of the 2nd stringer piece 12 is below the 1st stringer piece 11, the force from the downward side can be transmitted, and the stringer 10 becomes easier to bend.

  Further, in the vehicle rear structure according to the present embodiment, the side member 24 (25) is provided with the bead 24a, so that the side member 24 (25) is also deformed around the same position in the vehicle longitudinal direction as the bent portion of the stringer 10. Therefore, the side member 24 (25) does not prevent the stringer 10 from being bent. And the side member 24 (25) becomes easy to bend | fold more because the inclined part 24b is formed in the lower surface.

  Further, when the first stringer piece 11 and the second stringer piece 12 (in the vehicle width direction) are deformed in cross-section during a rear-end collision, the first stringer piece 11 and the second stringer piece 12 are not easily folded upward. The first stringer piece 11 and the second stringer piece 12 are provided with a first plate 13 and a second plate 14 respectively on the stringer piece 11 and the second stringer piece 12 to increase the strength of the cross-sectional shape. It is easy to fold upward while holding The third plate 15 is also provided for the same reason.

  Further, in the vehicle rear structure according to the present embodiment, the larger the radius of rotation of the first stringer piece 11 and the second stringer piece 12, the greater the upward bending of the stringer 10, and the more the EV component 34 collides with the front. It can be surely prevented. Therefore, a boundary portion (bead 10a) between the first stringer piece 11 and the second stringer piece 12 is arranged at an intermediate position between the rear end 23 and the cross member 31 in the vehicle longitudinal direction (beads of the side members 24 (25)). The same applies to the position 24a).

  Further, as shown in FIG. 6, the first plate 13 has only a vehicle front side end portion 13 b fixed to the cross member 31 to form a weakened portion 13 a, and the third plate 15 has an upper end side with respect to the bumper beam 32. The first and third plates 13 and 15 are easily bent upward at the weakened portion with respect to the impact at the time of rear collision, so that the stringer 10 can be more securely attached. It can be deformed upward.

  In the conventional structure, the rear end 23 on the rear side of the rear seat is pushed forward during a rear collision, and the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are retracted from the rear end 23. A load (predetermined from the rear of the vehicle) is transmitted to the seat cushion frames 21a and 21b and the seat back frames 22a and 22b, and the impact is absorbed by the seat cushion frames 21a and 21b and the seat back frames 22a and 22b. The EV component 34 arranged in front of it will not be cut and will be damaged.

  However, in the vehicle rear structure according to the present embodiment, the stringer 10 and the floor panel 30 are deformed upward, whereby the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are centered on the shaft 21. By rotating upward, interference with the EV component 34 arranged in front of the vehicle can be reduced (impact on the EV component 34 can be reduced).

  In the above description, the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are described as being rotated and stored toward the vehicle rear side, but conversely are rotated and stored toward the vehicle front side. It may be a thing.

  However, the EV component 34 must be disposed on the vehicle front side with respect to the seat cushion frames 21a and 21b and the seat back frames 22a and 22b in the stored state. Therefore, when the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are rotated and stored in the front side of the vehicle, the seat cushion frames 21a and 21b and the seat back frames 22a and 22b are on the rear side of the vehicle. Compared to the case of rotating and storing the EV component 34, it is necessary to arrange the EV component 34 more on the front side of the vehicle.

  Furthermore, in the above description, the seat cushion frames 21a and 21b in the retracted state and the components arranged on the vehicle front side with respect to the seat back frames 22a and 22b are the EV components 34, but the present embodiment is limited to this. It may not be a thing but other parts (parts with a high risk by damaging, such as a battery and a fuel tank).

[Example 2]
In the vehicle rear structure according to the present embodiment, in addition to the configuration of the vehicle rear structure according to the first embodiment, brackets are provided on the seat back frames 22a and 22b, respectively. Impact can be avoided. Hereinafter, the description of the seat back frame 22b is omitted, but the seat back frame 22b is the same as the seat back frame 22a.

  FIG. 7 is an arrow view corresponding to FIG. 3 for explaining the vehicle rear structure according to the present embodiment. The seat back frame 22a has a position around a position corresponding to a mountain-folded portion of the rear floor 30 (a position where the first stringer piece 11 and the front end portion of the second stringer piece 12 abut each other) at the time of a rear collision in the retracted state. The bracket 42a protruding toward the rear floor 30 (downward) is disposed. Thereby, at the time of a rear collision, a mode in which the rear seat seat jumps up substantially simultaneously with the start of the folding of the rear floor 30 can be realized.

  In particular, FIG. 7 shows a state in which the bracket 42a is provided on the first plate 13 side of the floor panel 30 in the seat back frame 22a. By arranging the bracket 42a in this way, the rotational force of the first stringer piece 11 at the time of the rear collision is transmitted to the seat back frame 22a, and the flip-up angle can be increased.

  The bracket 42a may be provided on the second plate 14 side in the floor panel 30 of the seat back frame 22a. When the bracket 42a is arranged in this manner, the rotational force of the second stringer piece 12 at the time of rear collision is transmitted to the seat back frame 22a, and the flip-up force can be secured, and the weight of the rear seat is large. Can also be supported.

  FIG. 8 is an arrow view corresponding to FIG. 4 for explaining the vehicle rear structure according to the present embodiment. As shown in FIG. 8, the seat back frame 22a corresponds to the position where the bead 24a is formed on the side member 24 (the upper end surface of the opening) of the side member 24 (in the U-shaped cross-sectional view in the vehicle width direction) in the retracted state. A bracket 43a protruding toward (downward) the side member 24 (opening end surface thereof) is disposed around the position to be moved. In this respect, the side member 25 side has the same configuration.

  As a result, the rear seat is also raised by the upward folding of the side members 24 and 25 at the time of the rear collision in the retracted state of the rear seat, and the EV component 34 in front of the vehicle of the stored seat at the time of the rear collision. The impact on the can be avoided more reliably.

  The vehicle rear structure according to the present invention has been described above in the first and second embodiments. In the first and second embodiments, the vehicle rear structure according to the present invention is applied when two rear seats are arranged side by side. For example, the rear seat is a bench type (integrated). If the seat frame is formed at a position corresponding to the stringer, the vehicle rear portion structure according to the present invention can be applied.

  The present invention is suitable as a rear structure of a vehicle.

10 stringer 10a (stringer 10) bead 11 first stringer piece 12 second stringer piece 13 first plate 13a weakened portion 14 second plate 15 third plate 20 rear seats 21a, 21b seat cushion frames 22a, 22b seat back frames 23 Rear end 24, 25 Side member 24a Bead 24b (of side member 24) Inclined portion 26 Shaft 30 Rear floor 31 Cross member 31a Open end surface 32 (of cross member 31) Bumper beam 34 EV component 41a Seat internal structure 42a, 43a Bracket

Claims (11)

A side member extending in the vehicle longitudinal direction at both ends in the vehicle width direction, a bumper beam extending in the vehicle width direction at the rear end of the vehicle, and extending in the vehicle width direction on the vehicle front side with respect to the bumper beam. A cross member fixed to the vehicle, and a seat cushion frame and a seat back frame that can be tilted by being overlapped at an angle along the longitudinal direction of the vehicle.
A vehicle rear structure that has a stringer that extends in the vehicle front-rear direction below the seat cushion frame and the seat back frame and is laid on the bumper beam and the cross member,
The stringer is provided at a position overlapping the frame of the seat back frame in the vehicle width direction, adjacent to the cross member, and a first stringer piece whose thickness in the vehicle height direction gradually decreases toward the vehicle rear side, and The second stringer piece adjacent to the bumper beam and gradually decreasing in the vehicle height direction toward the vehicle front side;
A vehicle rear structure, wherein a vehicle rear side end portion of the first stringer piece and a vehicle front side end portion of the second stringer piece are abutted against each other. The vehicle rear portion structure according to claim 1, wherein a cross section in the vehicle width direction of the first stringer piece and the second stringer piece is a U-shape in which an upper part is opened. 3. The vehicle rear portion structure according to claim 1, wherein a lowermost surface of the second stringer piece is positioned below a lowermost surface of the first stringer piece. A first reinforcing member fixed so as to close an upper end surface of the opening of the first stringer piece;
The vehicle rear part structure according to any one of claims 1 to 3, further comprising: a second reinforcing member fixed so as to close an upper end surface of the opening of the second stringer piece. The vehicle rear portion structure according to claim 4, wherein the first reinforcing member and the second reinforcing member are integrally formed via a first bead. The vehicle rear portion structure according to claim 4 or 5, wherein a vehicle front end portion of the first reinforcing member is fixed to the cross member. 7. The first reinforcing member has a weakened portion at a position adjacent to the vehicle rear side with respect to a fixed portion between the vehicle front end portion of the first reinforcing member and the cross member. Vehicle rear structure. A second bead is formed on the side member at a position corresponding to a position where a vehicle rear side end portion of the first stringer piece and a vehicle front side end portion of the second stringer piece abut each other in the vehicle longitudinal direction. The vehicle rear portion structure according to any one of claims 1 to 7, wherein: The lower surface of the side member is formed with an inclined portion that is inclined at an angle at which the vehicle front side is located above the vehicle rear side at a position including the second bead in the vehicle front-rear direction. The vehicle rear structure according to claim 8. The seat back frame protrudes downward around a position corresponding to a position where the vehicle rear side end portion of the first stringer piece and the vehicle front side end portion of the second stringer piece abut each other in the retracted state. The vehicle rear part structure according to any one of claims 1 to 9, wherein a first protrusion is provided. The seat back frame is provided with a second projecting portion projecting downward around a position corresponding to a position where the second bead is formed in the side member in the retracted state. The vehicle rear structure according to any one of claims 1 to 10.

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