A tubular body includes a long inner layer which draws a main lumen, a wire-reinforced layer which is formed by winding a reinforced wire around the inner layer, a long and plastic sub-tube which is assigned to extend along the longitudinal direction of the main lumen on the outside of the wire-reinforced layer and draws a sub-lumen which has smaller diameter compared the main-lumen, a plastic outer layer which includes the wire-reinforced layer and the sub-tube, and retaining wire. An operating line is housed inside the sub-lumen in a movable state and connected to the distal portion of the tubular body in its leading end. An operating portion bends the distal portion of the tubular body by pulling the operating line. The retaining wire is included in the outer layer and binds the sub-tube and the wire-reinforced layer together. The medical instrument (catheter) contacts with each of the outer periphery of the sub-tube and the outer surface of the wire-reinforced layer.本發明之管狀本體包含：長條之內層，其劃定主管腔；線加強層，其係將加強線捲繞於內層之周圍而成；樹脂製之長條之副管，其以沿著主管腔之長度方向延伸之方式配置於該線加強層之外側，且劃定直徑小於主管腔之副管腔；樹脂製之外層，其內包線加強層及副管；及保持線。操作線可移動地插通於副管腔之內部，且前端連接於管狀本體之遠位部。操作部將操作線進行牽引操作而使管狀本體之遠位部彎曲。保持線內包於外層，且將副管與線加強層一同捲繞。醫療用機器(導管)其保持線分別與副管之外徑側之周面及線加強層之外表面接觸。
