An endoscope 1 includes: operation wires 17, 18, 19 insertedly arranged inside an insertion portion 2 and an operation portion 3, the operation wires 17, 18, 19 causing a bending portion 12 to bend by being pulled/slackened an operation member 14, 50 provided on the operation portion 3, the operation member 14, 50 performing a bending operation of the bending portion 12 a rotation member 22, 53 provided in the operation portion 3, the rotation member 22, 53 pulling/slackening the operation wires 17, 18, 19 by rotating in conjunction with an operation of the operation member 14, 50 and an amount-of-operation-force reducing portion 30 giving rotation torque M in a direction in which the rotation member 22, 53 rotates to reduce an amount of operation force of the operation member 14, 50, in response to an operation of the operation member 14, 50.
