The endoscope 10 has a rod-like shaft portion 21 that can be operated to tilt by standing upright from one surface 18a of the operation portion main body 18 and capable of manipulating the bending angle of the bending portion 15 provided in the insertion portion 11. A central portion 25 that is watertightly sheathed with respect to the shaft portion 21, a peripheral portion 24 that has an edge portion 24 a that is provided on one surface 18 and that tightly closes an opening 18 m on which the rod-shaped shaft portion 21 is swingably disposed, and a peripheral portion A cover member 22 having an intermediate portion 26 provided between the portion 24 and the central portion 25, and the cover member 22 of the operation 20 bulges outward of the intermediate portion 26. A deformation restricting portion 27 for restricting 内視鏡１０は、挿入部１１に設けられた湾曲部１５の湾曲角度を操作可能な、操作部本体１８の一面１８ａから垂直方向に立設して傾倒操作可能な棒状軸部２１と、棒状軸部２１に対して水密に外装される中央部２５、一面１８に設けられ棒状軸部２１が揺動可能に配置される開口部１８ｍを水密に塞ぐ縁部２４ａを有する周辺部２４、及び周辺部２４と中央部２５との間に設けられた中間部２６を有するカバー部材２２と、を具備する操作子２０を備え、操作２０のカバー部材２２は、中間部２６の外方側への膨らみを制限する変形制限部２７を有する。
