It is aimed to enable a plurality of housings to be stacked without enlarging a connector. A connector includes a housing (60) including a lock receiving portion (67) inside and a case (10) internally provided with accommodation areas (13) capable of accommodating a plurality of the housings (60) in parallel and including lock portions (21) on back surfaces (18) of the accommodation areas (13), and the lock portions (21) resiliently lock the lock receiving portions (67) of the respective housings (60) to restrict the separation of the housings (60) from the accommodation areas (13).