PROBLEM TO BE SOLVED: To obtain an ultrasonic endoscope that can avoid rapid bending of a flexible line shape treatment instrument projected from an opening to be allowed to be gradually bent in the ultrasonic endoscope of a type in which a forceps channel is opened at a forward location from an ultrasonic probe in a distal end rigidity part having the ultrasonic probe.SOLUTION: A distal end structure of an ultrasonic endoscope in which that a past distal end rigidity part is a rigidity body by whole is renewed, includes: a proximal end rigidity part having an ultrasonic probe and a turning rigidity part pivoted turnably to the proximal end rigidity part, wherein a forceps channel is opened in the turning rigidity part, and a turning rigidity part operation mechanism that performs turning operation of the turning rigidity part is disposed in an operation portion.COPYRIGHT: (C)2014,JPO&INPIT【課題】超音波プローブを有する先端硬性部に、該超音波プローブより前方に位置させて鉗子チャンネルを開口させるタイプの超音波内視鏡において、同開口から突出させる可撓線状処置具の急激な屈曲を避け緩やかに屈曲させることができる超音波内視鏡を得る。【解決手段】従来の先端硬性部は全体が剛性体であったのを改め、超音波プローブを有する基端硬性部と、この基端硬性部に回動可能に枢着した回動硬性部とから構成して、この回動硬性部に鉗子チャンネルを開口させ、操作部に、回動硬性部を回動操作する回動硬性部操作機構を設けた超音波内視鏡の先端部構造。【選択図】図3
