To surely and easily clean a distal end face of a perspective endoscope during a treatment.SOLUTION: The axis L12, The distal end surface 12 e of the endoscope 10 of the endoscope apparatus 1 having the observation field of view in the oblique direction is cleaned by the cleaning liquid 4 w from the cleaning means 40. The cleaning means 40 includes an endoscope tip washing nozzle 42 extending along the perspective endoscope 10. The tip end portion 45 of the cleaning nozzle 42 is disposed on the lateral side or diagonally lateral side in the width direction orthogonal to the inclination direction of the leading end face 12 e. A slit-like discharge hole 45 a extending along the inclination direction is formed in a side portion of the nozzle tip portion 45 facing the endoscope 12.(Fig.【課題】斜視内視鏡における先端面を、施術中に確実かつ容易に洗浄可能とする。【解決手段】軸線L12に対して斜め方向への観察視野を有する内視鏡装置1の斜視内視鏡10の先端面12eを、洗浄手段40からの洗浄液4wによって洗浄する。洗浄手段40は、斜視内視鏡10に沿って延びる内視鏡先端洗浄ノズル42を含む。洗浄ノズル42の先端部45を先端面12eの傾斜方向と直交する幅方向の側方又は斜め側方に配置する。ノズル先端部45の内視鏡12を向く側部には、傾斜方向に沿うスリット状の吐出孔45aを形成する。【選択図】図11
