PROBLEM TO BE SOLVED: To provide a bending device of an intracavitary insertion tube or the like which prevents an excessive force from acting on the base end portion of a bending wire, achieves smooth operation, and improves durability even if a wire take-up drum having wire engagement grooves formed spirally on the outside periphery is arranged rotatably around the axis of an operating section.SOLUTION: The two wire engagement grooves 120 with the base end portions of a pair of bending wires 27 separately wound thereon are spirally formed on the outside periphery of the wire take-up drum 20. The wire engagement groove 120 with one of the base end portions of the pair of bending wires 27 wound thereon and the wire engagement groove 120 with the other base end portion wound thereon are formed in a reverse thread relation so that the directions of the grooves in the wire drawing out portions face the insertion tube rather than the directions vertical to the direction parallel with the axis of the operating section 10.COPYRIGHT: (C)2012,JPO&INPIT【課題】外周部にワイヤ係合溝が螺旋状に形成されたワイヤ巻取ドラムが、操作部の軸線周り方向に回転するように配置された構成のものであっても、湾曲操作ワイヤの基端部分に無理な力が作用せず、動作がスムーズで耐久性にも優れた体腔内挿入管類の湾曲操作装置を提供すること。【解決手段】ワイヤ巻取ドラム20の外周部に、一対の湾曲操作ワイヤ27の基端部分が個別に巻回される二つのワイヤ係合溝120が各々螺旋状に形成されて、一対の湾曲操作ワイヤ27の基端部分のうち一方が巻回されるワイヤ係合溝120と他方が巻回されるワイヤ係合溝120とが、共にワイヤ引き出し部分の溝の向きが操作部10の軸線と平行な方向に対し垂直をなす方向より挿入管の方を向くように、逆ねじの関係に形成されている。【選択図】 図1
