PROBLEM TO BE SOLVED: To provide an internal pressure adjustment device of an endoscope facilitating maintenance such as wash and having excellent durability and operability.SOLUTION: The internal pressure adjustment device of an endoscope includes: an outer casing that is inserted into an outer face opening for communicating the inside and the outside of the endoscope and has an insertion opening at a tip end facing the outside of the endoscope an opening/closing member that is located inside the outer casing, generally airtightly closes the insertion opening of the outer casing and, upon receiving pressing force of a pressing member, is moved inward the outer casing to open the insertion opening into a ventilation state and a lock mechanism that is provided in the outer casing, when the opening/closing member opens the insertion opening, regulates movement of the pressing member in a removal direction from the outer casing and, by a lock releasing operation, releases the movement regulation of the pressing member in the removal direction.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】洗浄などのメンテナンスが容易で、耐久性と操作性に優れた内視鏡の内圧調整装置を提供する。【解決手段】内視鏡の内部と外部を連通する外面開口に挿入され、内視鏡の外側に向く先端に挿入開口を有する外筒と、外筒の内側に位置し、通常は外筒の挿入開口を気密に塞ぎ、押圧部材による押圧を受けて外筒の内方に移動されて挿入開口を開いて通気状態にさせる開閉部材と、開閉部材が挿入開口を開いた状態で外筒からの離脱方向への押圧部材の移動を規制し、ロック解除操作によって押圧部材の離脱方向の移動規制を解除する、外筒内に設けたロック機構とを備えた。【選択図】図4
