PROBLEM TO BE SOLVED: To freely detachably mount a plurality of puncture adapters 1 capable of coping with various thicknesses of a puncture needle in an ultrasonic probe in a body cavity, and to improve accuracy of a puncture technique.SOLUTION: An ultrasonic probe in a body cavity includes a bend part and a head part 122 where a plurality of ultrasonic vibrators are arranged on a distal end part side of the bend part, and the head part 122 has a mounting part 122b which is provided on the bend part side, and to/from which a puncture adapter having a puncture needle guide for guiding a puncture needle is freely attachable and detachable.【課題】体腔内超音波プローブにおいて、種々な穿刺針の太さに対応できる複数の穿刺アダプタの１を脱着自在に装着させ、穿刺手技の精度を向上させること。【解決手段】屈曲部と、その屈曲部の先端部側で複数の超音波振動子が配置されるヘッド部１２２とを有する体腔内超音波プローブはヘッド部１２２に、屈曲部側に設けられ、穿刺針をガイドする穿刺針ガイドを有する穿刺アダプタが着脱自在な装着部１２２ｂを備える。【選択図】 図４
