A connector capable of being fitted to a partner connector is provided with a lock member, a solenoid having a plunger, a restriction member having a restricting part, and a restricted part. In a fitted state in which the connector and the partner connector are fitted to each other, the lock member engages the partner connector and locks the two connectors into a fitted state. The solenoid drives the plunger between a restriction position and a release position. The restriction member is movably supported by the plunger. The restricted part receives the restricting part when the plunger is driven into the restriction position. When the plunger is in the restriction position, movement of the restricted part is restricted by the restricting part, and thereby the restricted part directly or indirectly prevents release of the fitted state.