Ultrasonic endoscope 1 includes an insertion portion 2 inserted into the subject, is disposed in the distal end portion 5 of the insertion portion 2, the ultrasonic transducer 11 having an ultrasonic transmitting and receiving surface for transmitting and receiving ultrasonic waves, the insertion Part 2 and is a groove formed between the ultrasonic transducer 11, a first balloon groove 12a for engaging the balloon covering the ultrasonic transmitting and receiving, and the front end side of the ultrasonic transducer 11 It is arranged, and the distal end surface 5a disposed at a distance from the ultrasonic transmitting and receiving surface, which is provided on the distal end surface 5a, when it is slid a finger on the distal end face 5a, and has a projecting portion 14 where the stress is concentrated.超音波内視鏡1は、被検体に挿入される挿入部2と、挿入部2の先端部5に配置され、超音波を送受信する超音波送受信面を有する超音波振動子部11と、挿入部2と超音波振動子部11との間に形成された溝であり、超音波送受信を覆うバルーンを係止するための第1バルーン溝12aと、超音波振動子部11よりも先端側に配置され、超音波送受信面から離間して配設された先端面5aと、先端面5aに設けられ、先端面5a上で指を滑らせた際に、応力が集中する凸部14を有する。
