PROBLEM TO BE SOLVED: To provide an ultrasonic endoscope reducing a diameter of a distal end part by reducing a non use region of the distal end part of an inserting part and capable of properly guiding a treatment tool within a scanning area (observing area) of an ultrasonic wave observing part over a wide range of a lead-out angle (erecting angle of an erecting base) of the treatment tool from a treatment tool lead out opening without increasing operation load and complicating a constitution.SOLUTION: A treatment tool lead-out portion 54 having an erecting base 74 that erects a treatment tool led out of a treatment tool channel is arranged on a base end side of an ultrasonic transducer 60 in a tip part rigid portion 40 of an endoscope insertion section 22. The ultrasonic transducer 60 and the treatment tool lead-out portion 54 are arranged at a position shifted in the direction orthogonal to a scanning plane (scanning center plane of an ultrasonic wave), and the erecting base 74 is rotated around a rotational axis in a direction orthogonal to the scanning plane, and a guide surface is formed so as to guide the treatment tool in a direction intersecting the scanning plane.COPYRIGHT: (C)2014,JPO&INPIT【課題】挿入部の先端部の非使用領域を低減して先端部の細径化等を図ると共に、操作負担の増加や構成の複雑化を招くことなく、処置具導出口からの処置具の導出角度(起立台の起立角度)の広範囲に渡って処置具を超音波観察部の走査領域(観察領域)内に好適に誘導することができる超音波内視鏡を提供する。【解決手段】内視鏡挿入部22の先端部硬質部40において、超音波トランスデューサ60の基端側に処置具チャンネルから導出された処置具を起立させる起立台74を有する処置具導出部54が配置される。超音波トランスデューサ60と処置具導出部54とは超音波の走査面(走査中心平面)に対して直交する方向にずれた位置に配置され、起立台74は走査面に対して直交方向の回転軸周りに回動し、かつ、処置具を走査面と交差する方向に誘導するように誘導面が形成される。【選択図】図3
