1st angle of elevation 1 of the direction where 1st it passes by the center of window part 15 of gushing direction of the fluid where endoscope 2 is provided, from flat part 22 specified height from the window part 15 which is extended and flat part 22 opposing to window part, 15 directs to the surface of window part and 15 the nozzle the inclined section 23 where was formed to the margin of 19 for the air-supply/water-supply which gushes the fluid and window part 15 and, has, is gushed from nozzle 19 for the air-supply/water-supply in the tilt angle of skew for the flat part 22 of inclined section 23, parallels to the axis compared to, in the 1st axis the windowEnlarging the 2nd angle of elevation 2 of the direction which parallels to the 2nd axis which crosses in the center of the section, further cleaning Characteristic and water break Characteristic of window part 15 improve.内視鏡2は、平坦部22から所定の高さ突出した窓部15と、平坦部22から窓部15に対向して設けられ、窓部15の表面に向けて流体を噴出する送気送水用ノズル19と、窓部15の周縁部に形成された傾斜部23と、を備え、傾斜部23の平坦部22に対する傾斜角において、送気送水用ノズル19から噴出される流体の噴出方向の窓部15の中心を通る第1の軸に沿った方向の第1の仰角θ1よりも、第1の軸に窓部の中心で直交する第2の軸に沿った方向の第2の仰角θ2を大きくして、窓部15の更なる洗浄性および水切れ性が向上する。
