The present invention enables reliable and easy cleaning of the tip surface of an oblique-viewing endoscope during a procedure. A tip surface (12e) of an oblique-viewing endoscope (10) in an endoscopic device (1), which has an observation field of view inclined with respect to an axis (L12), is cleaned by a cleaning solution (4w) from a cleaning means (40). The cleaning means (40) includes an endoscope-tip cleaning nozzle (42) that extends along the oblique-viewing endoscope (10). A tip part (45) of the cleaning nozzle (42) is positioned diagonally sideward or sideward in the width direction perpendicular to the inclination direction of the tip surface (12e). A slit-like discharge hole (45a) along the inclination direction is formed in a side part of the nozzle tip part (45) facing the endoscope (12).本發明之目的係於施術中可確實且容易地清洗斜視內視鏡之前端面。藉由來自清洗機構40之清洗液4w,清洗具有朝向相對於軸線L12傾斜之方向之觀察視野之內視鏡裝置1之斜視內視鏡10之前端面12e。清洗機構40包含沿斜視內視鏡10延伸之內視鏡前端清洗噴嘴42。將清洗噴嘴42之前端部45配置於與前端面12e之傾斜方向正交之寬度方向之側方或斜側方。於噴嘴前端部45之朝向內視鏡12之側部,形成沿傾斜方向之縫隙狀之噴出孔45a。4w‧‧‧清洗液12‧‧‧插入部12e‧‧‧前端面42‧‧‧內視鏡前端清洗噴嘴45‧‧‧前端件(前端部)45a‧‧‧噴出孔
