To prevent a female member from being damaged, and prevent a male connector having a larger male member from being connected erroneously.SOLUTION: A female connector 1 includes a female member 10. An inner peripheral surface of the female member 10 includes a first region 11 and a second region 12 arranged on the tip side with respect to the first region 11. The first region 11 is a female tapered surface in which the inner diameter becomes larger as it approaches the tip of the female member. The second region 12 is a cylindrical surface in which the inner diameter is constant in a center axis direction.SELECTED DRAWING: Figure 7【課題】メス部材の損傷を防止し、また、より大きなオス部材を有するオスコネクタを誤って接続してしまうのを防止する。【解決手段】メスコネクタ１はメス部材１０を備える。メス部材１の内周面は、第１領域１１と、第１領域１１に対して先端側に配された第２領域１２とを含む。第１領域１１は、その内径が前記メス部材の先端に近づくにしたがって大きくなるメステーパ面である。第２領域１２は、その内径が中心軸方向において一定である円筒面である。【選択図】図７
