The bending operation device includes a bending operation member 45 provided in the operation unit 3 and supported to be tiltable in a predetermined direction, a bending unit 7 provided on the distal end side of the operation unit, and one end connected to the bending operation member. Operation wires 65a, 65b, 65c, 65d that are pulled and relaxed in accordance with the displacement of the bending operation member, and pulling wires 23a, 23b, 23c, 23d that have their tips connected to the bending portion and bend the bending portion by pulling and loosening, The other end of the operation wire is connected to the first position 64x, and the proximal end of the pulling wire is connected to the second position 64y that is moved from the first position by a predetermined angle in the direction around the longitudinal axis O of the operation unit. The connecting member 60 is held so as to be displaceable in accordance with the pulling / relaxation of the wire.湾曲操作装置は、操作部３に設けられ所定の方向に傾動可能に支持される湾曲操作部材４５と、操作部の先端側に設けられた湾曲部７と、湾曲操作部材に一端が接続されて湾曲操作部材の変位に応じて牽引弛緩される操作ワイヤ６５ａ、６５ｂ、６５ｃ、６５ｄと、湾曲部に先端が接続されて牽引弛緩により湾曲部を湾曲させる牽引ワイヤ２３ａ、２３ｂ、２３ｃ、２３ｄと、操作ワイヤの他端が第１の位置６４ｘに連結され第１の位置から操作部の長手軸Ｏの軸周り方向に所定の角度移動した第２の位置６４ｙに牽引ワイヤの基端が連結され操作ワイヤの牽引弛緩に応じて変位可能に保持された連結部材６０とを具備してなる。
