Problem to be solved: to provide a method of using a connector set, a connector, and a connector set in which the screw connection between the male screw portion and the female screw portion can be prevented from loosening, and the connector can be disengaged easily.Connector setA first connector having a first connecting portion, a first pushing portion and a first threaded portion provided on the first flow pathA second connector having a second connecting portion, a second pushing portion and a second threaded portion provided on the second flow pathIt is composed of a loosening section.The loosening portion isIn the tightened state of the first threaded portion and the second threaded portion in the pressed state between the first and second pushing portions in the connection state of the first connection portion and the second connecting portionAt least one of the first threaded portion and the second threaded portion can be urged so that the first threaded portion and the second threaded portion draw together in the axial direction along the predetermined axis.Diagram【課題】雄ねじ部と雌ねじ部とのねじ結合に緩みを生じ難くし、もって、コネクタの外れを生じ難くすることができる、コネクタセット、コネクタ、及びコネクタセットの使用方法を提供する。【解決手段】コネクタセットは、第１流路に設けられた第１接続部と第１押当り部と第１ねじ部とを有する第１コネクタと、第２流路に設けられた第２接続部と第２押当り部と第２ねじ部とを有する第２コネクタと、で構成されるとともに緩み防止部が設けられており、前記緩み防止部は、前記第１接続部と前記第２接続部との接続状態での前記第１押当り部と前記第２押当り部との押当り状態における前記第１ねじ部と前記第２ねじ部との締結状態において、前記第１ねじ部と前記第２ねじ部とが所定の軸線に沿う軸方向において互いに引張るように前記第１ねじ部及び前記第２ねじ部の少なくとも一方を付勢可能である。【選択図】図４
