The invention provides a catheter having a ring shape construction in which a tubular member 4 at a distal position is connected with a tubular member 5 at a proximate position. In the interior of tubular member 4, tubes 41, 42 are provided proximal to a peripheral side of tubular member 4, the tubes 41, 42 being for operating wires to be inserted therein. In the interior of tubular member 5, an inner cylinder 5b is provided at a central portion of the cross section of the tubular member 5, the inner cylinder 56 being for inserting operating wires therein. An intermediate member 100 is provided in between the tubes 41, 42 and the inner cylinder 5b. The tube 41 and the inner cylinder 5b are connected with each other through a channel 112 provided in the intermediate member 100. The tube 42 and the inner cylinder 5b are connected with each other through a channel 114 provided in the intermediate member 100. Channels 112 and 114 are configured to extend from the inner cylinder 5b slantingly towards the tubes 41 and 42 to approach a peripheral side of the tubular member 5.本發明提供一種導管，係具有由遠側的管狀構件4以及近側的管狀構件5所連結而成之環狀結構。在管狀構件4之內部中，於管狀構件4之外周側設置有供操作用金屬線插通之管41,42。此外，在管狀構件5之內部中，在管狀構件5之剖面中心部分設置有供操作用金屬線插通之內筒5b。中間構件100係設置在管41,42與內筒5b之間。藉由設置在中間構件100之通路112將管41與內筒5b連接。此外，藉由設置在中間構件100之通路114，將管42與內筒5b連接。通路112以及通路114係皆以從內筒5b側朝向管41,42之側且接近管狀構件5的外周之方式傾斜。
