PROBLEM TO BE SOLVED: To obtain an operation button structure of an endoscope that makes it possible to easily find damage to a button cover, the operation button structure of the endoscope including: a fixed cylinder provided in an operation unit of an endoscope a button cover made of an elastic member that is fluid-tightly supported by the fixed cylinder and constitutes a fluid-tight space and a piston body that is disposed inside the button cover and can be pushed in and operated by elastically deforming the button cover.SOLUTION: An operation button structure of an endoscope includes a check valve in a communication path for communicating a space in the operation unit with a fluid-tight space, the check valve inhibiting a fluid flow from the fluid-tight space to the space in the operation unit when the piston body is displaced via the button cover, and on the other hand, permitting a fluid flow from the space in the operation unit to the fluid-tight space when pressure in the space in the operation unit becomes higher than pressure in the fluid-tight space.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】内視鏡の操作部に設けた固定シリンダ;該固定シリンダに液密に支持され、液密空間を構成する弾性部材からなるボタンカバー;及び上記ボタンカバーを弾性変形させることで押し込み操作可能な該ボタンカバー内に配置されたピストン体;を有する内視鏡の操作ボタン構造において、ボタンカバーの破損を容易に発見できる内視鏡の操作ボタン構造を得ること。【解決手段】上記操作部内の空間と上記液密空間とを連通させる連通路に、上記ボタンカバーを介してピストン体を変位させたとき、上記液密空間から操作部内空間への流体流を阻止する一方、上記操作部内空間の圧力が液密空間の圧力より高くなったときには、該操作部内空間から液密空間への流体流を許す逆止弁を設けた内視鏡の操作ボタン構造。【選択図】図2
