A catheter of the present invention includes a long and flexible tubular body, a plurality of operating lines which are housed inside the tubular body and connected to the distal portion of the tubular body in its leading end, an operating body located on the base end of the tubular body and a bending operation portion. The bending operation portion has engaging portions which engage with the base ends of the operating lines and bends the distal portion of the tubular body by adding traction to each operating line individually by pulling manipulation. The bending operation portion is formed so as to be capable of moving relative to the operating body. Relative movement of the bending operation portion and the operating body increases or decreases the path length from the leading portion of each operating line to each engage portion.本發明之導管包含：長條且可撓性之管狀本體；複數根操作線，其等插通於該管狀本體中，且前端部連接於管狀本體之遠位部；操作部本體，其設置於管狀本體之基端部；及彎曲操作部。彎曲操作部包含與操作線之基端部卡合之卡合部，藉由牽引操作，對複數根操作線個別地賦予牽引力而使管狀本體之遠位部彎曲。彎曲操作部係相對於操作部本體可移動地設置。藉由使彎曲操作部與操作部本體相對移動，複數根操作線之自前端部至卡合部之路徑長度隨之增大或減小。
