A connector includes a housing into which a cable is to be inserted, a terminal accommodated in the housing and configured to be conductively connected to the cable, and a lever attached to the housing so as to turn between the first and second positions. The lever includes attachment parts to be attached to supporting parts of the housing, at both ends in the direction in which the turning shafts of the lever extend. Either the attachment parts or the supporting parts, or both of them include a defective-closing prevention structure which prevents the lever from turning from the first position to the second position when the cable is not inserted in the housing.