The endoscope includes a tubular member that is inserted into an opening formed in a distal end portion of the insertion portion from the opening of the hole toward the bottom portion so as to be disposed in the hole, a cylindrical member that is inserted into the hole from the inner circumferential surface of the hole A protruding portion protruding inward in the direction, and a protruding portion which is provided on the outer peripheral surface of the tubular member and is elastically deformed when being moved together with the tubular member from the opening toward the bottom portion, And an elastic member which abuts against a surface of the hole facing the bottom portion of the hole in the protruding portion and is elastically deformed to urge the tubular member toward the bottom portion, And a restricting portion that is provided on the side closer to the opening than the elastic member and regulates movement of the cylindrical member toward the side close to the bottom portion in a state where the cylindrical member is disposed in the hole.内視鏡は、挿入部の先端部に形成された孔に、前記孔の開口から底部に向かって挿入されることで前記孔に配置される筒状部材と、前記孔の内周面から径方向内方に向かって突出する突出部と、前記筒状部材の外周面に設けられ、前記筒状部材とともに前記開口から前記底部に向かって移動される際に弾性変形することで前記突出部を乗り越え、前記突出部における前記孔の前記底部を向いた面に当接し弾性変形することで前記筒状部材を前記底部に向けて付勢する弾性部材と、前記筒状部材の前記外周面の前記弾性部材よりも開口に近接する側に設けられ、前記筒状部材が前記孔に配置されている状態で前記筒状部材における前記底部に近接する側への移動を規制する規制部とを有する。
