PROBLEM TO BE SOLVED: To provide an endoscope bending operation mechanism which eliminates a failure of interrupting a maximum tilting operation state by a bending boot without increasing the size of an operational part.SOLUTION: An endoscope bending operation mechanism includes: a bending mechanism part which has a bending lever 22 which protrudes outward with respect to an operational part from an opening 27m formed on the operational part provided on a proximal end part of an insertion part which can be inserted into a subject and has a bending part that can be bent into four directions of upward, downward, rightward, and leftward directions for making tilting operation into the four directions corresponding to the four directions of the bending part and is configured to pull and loosen a bending wire having one end connected to the bending part and a bending boot 30 which has a cylindrical shape and includes a boot plane part 31 having a through-hole 31h where an intermediate part of the bending lever 22 is arranged, a boot side peripheral part 32 which is provided with spiral recessed and protruding parts extending in an axial direction from a rear surface 31b of the boot plane part 31 to have flexibility and restoring properties, and a boot edge part 33 which is provided on the boot side peripheral part 32 and is arranged along the opening 27m.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2016,JPO&INPIT【課題】操作部を大型化させることなく、湾曲ブーツによって最大傾倒操作状態が妨げられる不具合を解消した内視鏡湾曲操作機構を提供する。【解決手段】内視鏡湾曲操作機構は、被検体に挿入可能で上下左右の四方向に湾曲可能な湾曲部を有する挿入部の基端部に設けられた操作部に形成された開口27mから操作部外方に突出され、湾曲部の四方向に対応付けた四方向に傾倒操作可能な湾曲レバー22を有する、湾曲部に一端が連結された湾曲ワイヤを牽引弛緩するための湾曲機構部と、筒形状であって、湾曲レバー22の中間部が配置される貫通孔31hを有するブーツ平面部31、ブーツ平面部31の裏面31bから軸方向に延設される螺旋凹凸部を設けて柔軟性と復元性とを有するブーツ側周部32、及び、ブーツ側周部32に設けられ、開口27mに沿って配設されるブーツ縁部33、を有する湾曲ブーツ30と、を具備する。【選択図】図7
