A tubular soft member forming elasticity and constituting the outermost layer of the curved portion, a curved portion fixed rigid portion in which the end portion of the tubular flexible member is disposed, and an end portion of the tubular flexible member arranged in the curved portion fixed rigid portion And a bending portion end portion fixing portion for fixing the end portion of the bending portion, wherein the bending portion has a curved portion end portion small diameter portion whose outer diameter dimension is set to a small diameter at the longitudinal axis end portion, and the curved portion end The outer diameter of the covering portion constituting the portion fixing portion is set to be smaller than the outer diameter of the curved portion fixed rigid portion side end portion and the outer diameter of the intermediate tube portion end portion of the tubular flexible member which are opposed to each other across the small diameter end portion of the curved portion It has a small diameter.弾性を有し湾曲部の最外層を構成する管状柔軟部材と、管状柔軟部材の端部が配置される湾曲部固定硬質部と、湾曲部固定硬質部に配置された管状柔軟部材の端部を固定するための湾曲部端部固定部と、を備えた内視鏡において、湾曲部は、長手軸端部に外径寸法を小径に設定した湾曲部端部小径部を有し、湾曲部端部固定部を構成する被覆部の外径は、湾曲部端部小径部を挟んで対設する湾曲部固定硬質部側端部の外径及び管状柔軟部材の中間管部端部の外径より小径である。
