A female connector including: a cylindrical core member having a luer taper on a distal inner surface thereof and a tube bonding portion formed on a proximal end inner surface and being formed with a flange at a distal extremity thereof; a cylindrical housing having a male screw formed on an outer surface thereof and mounted to an outer periphery of the core member without being fixed, and a stopper fixed at a position apart from the flange of the core member, wherein the distance (L1) between the flange and the stopper is larger than the length (L2) of the housing in the axial direction when a male connector is connected to the female connector.