A connector comprises a movable member and an operating member and is mateable with a mating connector. The movable member is movable between a front position and a rear position of a movement range. The operating member is movable between a front position and a rear position of an operation range and is movable relative to the movable member. The mated state of the connector is locked when the operating member is positioned at the front position of the operation range and when the movable member is positioned at the front position of the movement range. The mated state is unlocked when the operating member is positioned rearward of the front position of the operation range by a predetermined distance and when the movable member is positioned at the front position of the movement range.