In the present invention, a lever (30) is coupled to a base end portion (13) of a male luer through a base (15). The lever is provided with a locking portion (31) and a handling portion (35). A locking claw (32) projects from the locking portion toward the male luer. A lock ring (8) is disposed facing the inside surface of the handling portion. The lock ring can be shifted between a first position at which the lock ring is close to the base and a second position at which the lock ring is away from the base. When the lock ring is at the first position, the lever can be turned to cause the locking claw to be separated from the male luer. When the lock ring is at the second position, the lock ring restrains the lever from turning to cause the locking claw to be separated from the male luer.
