In a power supply connector, when defect is detected at the locking part by the defect detection means, sliding of the connector body and the grasping member with respect to the case is locked by the case lock mechanism; when defect is not detected at the locking part, the case lock mechanism is released and the connector body and the grasping member become slidable in a direction of nearly the same axis line with respect to the case. When the grasping member is slid forward with respect to the case in a state in which the case lock mechanism is released, the connector body becomes movable to the front with respect to the case. As a result, in the power supply connector, the connector in the power supply side is not connectable to the connector of the power reception side when there is a defect in the locking part.