PROBLEM TO BE SOLVED: To provide a branch pipe in which the tip is connected to a tubular member, one of passages becomes an insertion passage of an introduced object, and which can easily incorporate the introduced object without damaging the introduced object at the time of insertion from the branch pipe to the tubular member even if the introduced object is a long, linear and delicate object such as one optical fiber.SOLUTION: A branch pipe which has a connection part with a tubular member on a tube tip part 11 (distal end) and in which a main tube passage 10 and a side tube passage 20 are formed by branching a lumen toward a proximal side in the middle of the lumen is configured so that a corner part is not provided by giving roundness to a transition part whose inner diameter is formed to be smaller toward the distal side from a branch part 14 with the side tube passage of the main tube passage and toward the distal side, and an intersection point 150 between the extension line of a central axis 15 of the side tube passage and an inner peripheral surface of the main tube passage is formed so as to be located on the inner peripheral surface of a straight part 131 where the inner diameter of the main tube passage is constant.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】先端部を管状部材に接続して用いる、通路の一方が導入物の挿通通路となる分岐管において、導入物が、例えば1本の光ファイバーのような長尺線状で繊細なものであっても、分岐管から管状部材への挿入のさいに、該導入物を破損することなく、容易に組み込むことができる分岐管を提供すること。【解決手段】管先端部11(遠位端)に管状部材との接続部を設け、内腔を該内腔の中途で近位側に向け分岐させ主管通路10、及び、側管通路20として形成する分岐管において、主管通路の側管通路との分岐部14より遠位側に向かって、該遠位側に向け内径を小さく形成する遷移部に丸みを持たせ角部を設けない構成とし、また、前記側管通路の中心軸15の延長線と主管通路の内周面との交点150は、主管通路の内径が一定しているストレート部131の内周面に位置するように形成した。【選択図】図2
