PROBLEM TO BE SOLVED: To provide a conduit switching device of an endoscope preventing abrasion and damage of a check valve and improving cleaning properties.SOLUTION: A check valve unit 151 of this conduit switching device 100 includes: a check valve 153 that is opened/closed according to an internal pressure of the cylinder 111 to be closely stuck to the inner peripheral face of a cylinder 111 or separated from the inner peripheral face thereof a contact member 155 to which the check valve 153 is stuck and that comes into contact with a contact face 111c and a support member 157 that supports the check valve 153 and the contact member 155 such that, when a piston shaft part 123 moves with respect to the cylinder 111, the contact member 155 constantly contacts with the contact face 111c, and, when the contact member 155 comes into contact with the contact face 111c, the location of the check valve 153 is fixed relative to the cylinder 111.COPYRIGHT: (C)2013,JPO&INPIT【課題】逆止弁の磨耗と損傷とが防止され、洗浄性が向上する内視鏡管路切換装置を提供すること。【解決手段】管路切換装置100において、逆止弁ユニット151は、シリンダ111の内部の圧力に応じて開閉することで、シリンダ111の内周面に密着または内周面から離れる逆止弁153と、逆止弁153が接着され、当接面111cに当接する当接部材155と、ピストン軸部123がシリンダ111に対して移動する際に、当接部材155が当接面111cに常に当接し、当接部材155が当接面111cに当接することに伴いシリンダ111に対する逆止弁153の相対的な位置が固定されるように、逆止弁153と当接部材155とを支持する支持部材157とを有している。【選択図】 図2A
