The bending operation device 70 includes a bending lever 45 supported so as to be capable of tilting at an angle with respect to the longitudinal direction of the operation unit 3 of the endoscope 1, a plurality of bending levers 45 that are displaced in conjunction with the tilting operation of the bending lever 45 A wire pulling member 54 having an arm portion 54 b and a plurality of arm portions 54 b connected to the arm portion 54 b so as to bend the bending portion 7 provided in the insertion portion 2 of the endoscope 1 according to the displacement of the wire pulling member 54 When the bending lever 45 in which the bending portion 7 is substantially linear is in the neutral position, the plurality of operating wires 65 a to 65 d are guided to the plurality of arm portions 54 b so that the plurality of operating wires 65 a to 65 d are substantially parallel And a plurality of pulleys 68a to 68d.湾曲操作装置70は、内視鏡1の操作部3の長手方向に対して角度を有して傾動可能に支持された湾曲レバー45と、湾曲レバー45の傾動動作に連動して変位する複数のアーム部54bを備えたワイヤ牽引部材54と、複数のアーム部54bに接続されて、ワイヤ牽引部材54の変位に応じて内視鏡1の挿入部2に設けられた湾曲部7を湾曲動作する複数の操作ワイヤ65a~65dと、湾曲部7が略直線状となる湾曲レバー45が中立位置のときに、複数の操作ワイヤ65a~65dが略平行となるように複数のアーム部54bへと導く複数のプーリ68a~68dと、を具備する。
