An endoscope includes an insertion portion, a bending portion bendable in an up-down direction and a left-right direction, a traction member for bending the bending portion, an operation portion provided at a proximal end of the insertion portion, an operation input portion provided in the operation portion, tiltable with respect to a first direction for bending the bending portion in the up-down direction and a second direction for bending the bending portion in the left-right direction, and for performing an operation input for acting on the traction member according to tilting operation and bending the bending portion, and an operation force amount adjusting portion configured to adjust an operation force amount for tilting the operation input portion in the first direction and an operation force amount for tilting the operation input portion in the second direction to be different.内視鏡は、湾曲部を有する挿入部と、湾曲部を牽引により湾曲させる牽引部材と、湾曲部を湾曲させるための操作入力を行う操作部と、操作部の操作入力部を構成し、湾曲部の湾曲方向に対応して設けられた連結部材を有し、操作入力を行うための傾倒操作により操作部に設けられた回転軸を中心に回動して、傾倒方向に牽引部材を牽引する操作子と、操作子の傾倒操作に応じて牽引部材に作用し、操作子の傾倒に必要な操作力量を調整する操作力量調整部と、を有する。
