To provide an endoscope apparatus capable of perfusing a surgical field to prevent leakage of effluent from a surgical field from a surgical instrument insertion port and securing smooth operability of a surgical instrument.SOLUTION: An irrigation fluid supply channel 30 is provided along an insertion portion 12 of an endoscope 10 so that the operation field 9 a can be perfused. A surgical instrument insertion opening 45 is provided in the proximal portion 11 of the endoscope 10, and a container-like liquid discharge portion 40 is provided. A liquid discharge port 44 is provided in the liquid discharge part 40 to communicate with the surgical instrument channel 15. The drain port 44 is disposed on the side of the insertion section 12 from the surgical instrument insertion port 45.(FIG.【課題】術野を灌流可能な内視鏡装置において、術野からの流出液が術具挿入口から漏れ出るのを防止するとともに、術具の円滑な操作性を確保する。【解決手段】内視鏡10の挿入部12に沿って灌流液供給チャンネル30を設け、術野9aを灌流可能とする。内視鏡10の手元部11には、術具挿入口45を設け、かつ好ましくは容器状の液排出部40を設ける。液排出部40に排液ポート44を設け、術具チャンネル15と連通させる。排液ポート44を術具挿入口45より挿入部12側に配置する。【選択図】図3
