A connector is matable with a mating connector which has an engaged portion. The connector comprises a support portion and a lock member pivotally supported by the support portion. The lock member comprises a body portion, a lock portion, a spring portion and an operated portion. The body portion comprises a first predetermined portion which has a plate-like shape and is pivotally supported by the support portion. The lock portion is movable between a lock position and a release position in response to a pivotal movement of the body portion. The lock portion comprises an engaging portion engagable with the engaged portion. The engagement of the engaging portion with the engaged portion is locked when the lock portion is positioned at the lock position, while the engagement is released when the lock portion is positioned at the release position. The spring portion urges the lock portion to move toward the lock position. The spring portion extends from the body portion and has a second predetermined portion, which is parallel to the first predetermined portion but is different in position from the first predetermined portion in a direction perpendicular to the first and the second predetermined portions. The operated portion is formed and arranged to force the lock portion to move to the release position when the operated portion is operated.