The endoscope 1 includes an insertion portion 2 extending from the operation portion 3 to the distal end side and having a curved portion 12, a plurality of tows disposed in the insertion portion 2 and the operation portion 3 from the bending portion 12 A member 23, 25, a disc member rotatably provided in the operation unit 3, a plurality of pulling members 23, 25 bridging the outer periphery and rotating to pull and relax the plurality of pulling members 23, 25 21, operating members 4, 5 which are rotatably disposed on the operation unit 3 and rotate the disk member 21 to bend the bending portion 12, and in an initial state where the bending portion 12 is linear, The disk member 21 and the operating members 4, 5 are pivotably supported on the operating portion 3 at positions where the rotating shaft 22 is eccentric toward the distal end side by a predetermined distance d with respect to the center of the disk member 21 And a rotating shaft 22.内視鏡1は、操作部3から先端側に延出し、湾曲部12が配設された挿入部2と、湾曲部12から挿入部2内および操作部3内に配設される複数の牽引部材23,25と、操作部3内に回動自在に設けられ、複数の牽引部材23,25が外周に架設され、回動することで複数の牽引部材23,25を牽引弛緩する円板部材21と、操作部3に回動自在に配設され、円板部材21を回動して湾曲部12を湾曲操作する操作部材4,5と、湾曲部12が直線状となる初期状態において、回動軸22が円板部材21の中心に対して、所定の距離dだけ先端側へ偏心した位置で円板部材21および操作部材4,5を操作部3に対して回動自在に軸支する回動軸22と、を備える。
