The endoscope 1 includes operation wires 17, 18, and 19 which are inserted through the insertion portion 2 and the operation portion 3 and bend the bending portion 12 by towing and relaxation, and manipulation wires 17, 18, 19 provided on the operation portion 3, and the bending portion 12 Operating members 14, 50 for operating the bending operation, rotating members 22, 53 provided in the operating section 3 and rotating and rotating in conjunction with the operation of the operating members 14, 50 to pull and loosen the operating wires 17, 18, 19 , And an operation force amount reduction unit (30) that reduces the amount of operation force of the operation members (14, 50) by applying rotational torque (M) in a direction in which the rotation members (22, 53) rotate in accordance with the operation of the operation members (14, 50).内視鏡1は、挿入部2および操作部3の内部に挿通配設され、湾曲部12を牽引弛緩により湾曲させる操作ワイヤ17,18,19と、操作部3に設けられ、湾曲部12を湾曲操作する操作部材14,50と、操作部3内に設けられ、操作部材14,50の操作に連動して回転することで操作ワイヤ17,18,19を牽引弛緩する回転部材22,53と、操作部材14,50の操作に応じて、回転部材22,53が回転する方向に回転トルクMを与えて操作部材14,50の操作力量を低減する操作力量低減部30と、を具備する。
