The endoscope 1 has a distal end fixed to the bending portion 7 including the first bending portion 7a and the second bending portion 7b, the flexible tube portion 8, the operation portion 3, and the second bending portion 7b. The upper coil 43u, which is movable forward and backward within the operation unit 3, and the second coil 44 whose distal end is fixed to the flexible tube unit 8 and whose proximal end is fixed to the operation unit 3 are connected. Provided in the operation unit 3, the coil receiving body 60, the switching unit 55 that presses the upper coil receiving unit 60 and compresses the upper coil 43 u, the bending length switching wire 47 connected to the switching unit 55. A switching pulley 46 that moves the upper coil receiver 60 forward and backward via the switching unit 55 and a superposition on the switching pulley 46 are formed so as to increase the frictional force as the switching pulley 46 rotates. And a cam plate 82 having a cam portion 85.内視鏡１は、第１湾曲部７ａ及び第２湾曲部７ｂを備えた湾曲部７と、可撓管部８と、操作部３と、第２の湾曲部７ｂに先端が固定された上用コイル４３ｕと、可撓管部８に先端が固定され操作部３内に基端が固定された第２のコイル４４と、操作部３内で進退自在な上用コイル４３ｕが接続された上用コイル受体６０と、上用コイル受体６０を押圧して上用コイル４３ｕを圧縮する切替部５５と、切替部５５に接続された湾曲長切替ワイヤ４７と、操作部３内に設けられ切替部５５を介して上用コイル受体６０を進退移動させる切替プーリ４６と、切替プーリ４６に重ねられて配置され、切替プーリ４６の回動に伴って摩擦力を増加させるように形成されたカム部８５を有するカム板８２と、を具備する。
