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超音波を送受信させる超音波送受信部と、前記超音波送受信部を有する先端部を湾曲させる湾曲部と、体腔内に留置する管に挿入可能であり穿刺針を挿入する機構とを備えた体腔内超音波探触子において、前記湾曲部とグリップ間の硬性部を２方向から覆う着脱式のカバーを備え、前記硬性部と前記カバー間には前記穿刺針を挿入させる隙間部を有することを特徴とする体腔内用超音波探触子。An ultrasonic transceiver which transmits and receives ultrasonic waves, the curved portion for bending the distal portion having an ultrasonic transmitting and receiving unit,in a body cavity and a mechanism for inserting a and puncture needle insertable into a tube placement in the body cavity The ultrasonic probe includes a detachable cover that covers the rigid portion between the curved portion and the grip from two directions, and has a gap portion for inserting the puncture needle between the rigid portion and the cover. An ultrasonic probe for body cavity.