An endoscope comprising: an insertion portion including a bending portion; a traction member for bending the bending portion through traction; an operation portion provided at a proximal end of the insertion portion and provided with an operation input portion configured to perform an operation input for bending the bending portion; a manipulator configuring the operation input portion, the manipulator including a coupling member which is coupled with the traction member and which is provided to correspond to a bending direction of the bending portion, the manipulator towing the traction member by pivoting around a rotating shaft provided to the operation portion through an operation for performing the operation input; and the bending portion is bendable in an up-down direction and a left-right direction, and the traction member includes an up-down direction traction member (8u, 8d) for bending the bending portion in the up-down direction and a left-right direction traction member (81, 8r) for bending the bending portion in the left-right direction, wherein the operation of the manipulator for performing the operation input is tilting operation, and the traction member is towed in a tilting direction by the tilting operation, the manipulator has tilting directions in the up-down direction and the left-right direction respectively corresponding to the bending in the up-down direction and the bending in the left-right direction, the coupling member includes a cross-shaped arm corresponding to the up-down direction and the left-right direction of the bending portion, a hand side end portion of the traction member being fixed to the arm, characterized in that the endoscope further comprises an operation force amount adjusting portion configured to act on the traction member according to the tilting operation of the manipulator, wherein the operation force amount adjusting portion is provided in the manipulator, includes a contact portion configured to come into contact with the traction member extending from the coupling member and transmit an operation force amount due to tilting of the manipulator to the traction member, and enables an attachment position of the coupling member in a longitudinal direction of the arm to be changed so as to change a distance from the rotating shaft at the time when the traction member comes into contact with the contact portion near the coupling member and enable the operation force amount to be adjusted. an insertion portion including a bending portion; a traction member for bending the bending portion through traction; an operation portion provided at a proximal end of the insertion portion and provided with an operation input portion configured to perform an operation input for bending the bending portion; a manipulator configuring the operation input portion, the manipulator including a coupling member which is coupled with the traction member and which is provided to correspond to a bending direction of the bending portion, the manipulator towing the traction member by pivoting around a rotating shaft provided to the operation portion through an operation for performing the operation input; and the bending portion is bendable in an up-down direction and a left-right direction, and the traction member includes an up-down direction traction member (8u, 8d) for bending the bending portion in the up-down direction and a left-right direction traction member (81, 8r) for bending the bending portion in the left-right direction, wherein the operation of the manipulator for performing the operation input is tilting operation, and the traction member is towed in a tilting direction by the tilting operation, the manipulator has tilting directions in the up-down direction and the left-right direction respectively corresponding to the bending in the up-down direction and the bending in the left-right direction, the coupling member includes a cross-shaped arm corresponding to the up-down direction and the left-right direction of the bending portion, a hand side end portion of the traction member being fixed to the arm, characterized in that the endoscope further comprises an operation force amount adjusting portion configured to act on the traction member according to the tilting operation of the manipulator, wherein the operation force amount adjusting portion is provided in the manipulator, includes a contact portion configured to come into contact with the traction member extending from the coupling member and transmit an operation force amount due to tilting of the manipulator to the traction member, and enables an attachment position of the coupling member in a longitudinal direction of the arm to be changed so as to change a distance from the rotating shaft at the time when the traction member comes into contact with the contact portion near the coupling member and enable the operation force amount to be adjusted.