An object of the present invention is to provide a connector and a fluid bag assembly that can perform a connection operation to a fluid bag without excess and deficiency. A connector includes a first connection portion connected to an opening of a fluid bag by screwing, and a second connection portion connected to an opening of a syringe as a suction tool by screwing. 3 is provided. The first connection portion 2 has a cylindrical shape, and includes a first screw portion 22 having a first screw thread 221 formed in the circumferential direction having one or more turns, and a first screw portion 221 and a mouth portion 81. And a screwing completion recognition unit 5 for recognizing screwing completion. The second connection portion 3 has a cylindrical shape, and has a second screw portion 32 in which a second screw thread 321 formed in the circumferential direction has one or more turns. [Selection diagram] Fig. 1【課題】流体バッグに対する接続操作を過不足なく行うことができるコネクタおよび流体バッグ組立体を提供すること。【解決手段】コネクタ１は、流体バッグ２０の口部８１に螺合によって接続される第１接続部２と、吸引具としてのシリンジ３０の口部９１に螺合によって接続される第２接続部３とを備える。第１接続部２は、筒状をなし、その周方向に形成された第１ねじ山２２１が１周以上である第１螺合部２２と、第１螺合部２２と口部８１との螺合完了を認識させる螺合完了認識部５とを有する。また、第２接続部３は、筒状をなし、その周方向に形成された第２ねじ山３２１が１周以上である第２螺合部３２を有する。【選択図】図１
