PROBLEM TO BE SOLVED: To provide a suction operation device for an endoscope, including an excellent function, having good operability with a small press-in operation force amount, not allowing the increase of the size of the device, and not causing so-called natural suction.SOLUTION: Each of edge parts of a bottom face 18a of a lateral hole-like flow passage 18 facing an inlet of a longitudinal hole-like flow passage 16 is formed in a slant face 18b obliquely advancing to the longitudinal hole-like flow passage side 16, and outside air passing through the lateral hole-like flow passage 18 and flowing into the longitudinal hole-like flow passage 16 in a standby state flows to a direction along the slant faces 18b in a boundary part between the lateral hole-like flow passage 18 and the longitudinal hole-like flow passage 16.COPYRIGHT: (C)2014,JPO&INPIT【課題】押し込み操作力量が小さくて操作性がよく、しかも装置を大型化することなく、いわゆる自然吸引が発生しない優れた機能を備えた内視鏡の吸引操作装置を提供すること。【解決手段】縦向き穴状流路16の入口を臨む横向き穴状流路18の底面18aの縁部が、縦向き穴状流路側16に斜行した斜面18bにされていて、待機状態のときに横向き穴状流路18を通過して縦向き穴状流路16に流入する外気が、横向き穴状流路18と縦向き穴状流路16との境界部において斜面18bに沿う方向に流れるようにした。【選択図】 図1
