Problem to be solved: to provide an endoscope capable of preventing the damage of the insertion tube through a treatment instrument with a high restoring force against bending.Solution: the treatment tube insertion tube 27 provided in the insertion portion from the operating section 2, and the internal diameter portion of the treatment vessel introduction pipe 19b extending from the opening portion 19A toward the D2 direction and communicating with the treatment tool insertion tube 27 through the bent portion 19C, and the inner diameter portion The step of connecting the step 21 to the first hole 21 provided in the insertion hole 21k, and the tube deformation part 27a of the treatment instrument insertion tube 27 which is deformed in the D2 direction when inserting the treatment tool, and the load when the tube deformation part 27a abuts on the step part WeirThe endoscope 1 having the chamfered portions 21e and 21h.Diagram【課題】曲げに対する復元力が強い処置具を挿通した場合にも、処置具挿通チューブの損傷を防止することができる内視鏡を提供する。【解決手段】操作部2から挿入部に内設された処置具挿通チューブ27と、開口部19aからD2方向へ向けて延長され、折曲部19cを経て処置具挿通チューブ27に連通する処置具導入管路19bと、異なる内径部分を接続する段差部が挿通孔21kに設けられた第1口金21と、処置具を挿入したときにD2方向に変形する処置具挿通チューブ27のチューブ変形部27aと、段差部にチューブ変形部27aが当接するときの負荷を和らげる面取部21e,21hと、を備える内視鏡1。【選択図】図2
