PROBLEM TO BE SOLVED: To provide a flow channel branch pipe and a blood bag system having the flow channel branch pipe in which an error in the flow channel selection due to a human error does not occur. A flow channel branch pipe (1) held by a jig of a separation device for separating blood into predetermined blood components, which is a main body port (2) and a plurality of branch ports (3) branched from an end of the main body port (2). 4, and the plurality of branch ports are erected on the side of the upper surface that is the opposite surface of the lower surface held by the jig, and formed between each of the plurality of branch ports and the main body port. In the plane, at least one set of planes is provided that are symmetrical with respect to the plane passing through the axis of the main body port, and the surface shape of the lower surface 1a and the surface shape of the upper surface 1b held by the jig are different. [Selection diagram] Fig. 3【課題】人為的なミスによる流路選択の間違いが発生しない流路分岐管およびそれを有する血液バッグシステムを提供する。【解決手段】血液を所定の血液成分に分離する分離装置の冶具に保持される流路分岐管１であって、本体ポート２と、本体ポート２の端部から分岐される複数の分岐ポート３、４と、を有し、複数の分岐ポートは、冶具に保持される下面の反対面である上面の側に立設し、複数の分岐ポートの各々と本体ポートとの間で形成される各平面において、本体ポートの軸を通る平面を介して対称となるよう構成された平面を少なくとも１組備え、冶具に保持される下面１ａの表面形状と、上面１ｂの表面形状とが異なる。【選択図】図３
