The invention relates to a housing for a plug-in connection, comprising a lower shell element (100) and an upper shell element (200) that is identical to the lower shell element (100), each shell element (100, 200) containing a retaining element (2), by means of which a plug-in connector (1) can be secured to the housing. Each shell element (100, 200) contains a receptacle (3), in which a cable mount (9) can be received and each shell element (100, 200) has at least one detent element (11, 12, 13, 14) that cooperates with a mating detent element (21, 22, 23, 24) of the other shell element (200, 100). The detent elements (11, 12, 13, 14) and the mating detent elements (21, 22, 23, 24) have a multi-step design and the entire border regions between the shell elements (100, 200) forming the housing, with the exception of openings for the plug-in connector (1) and the cable mount (9), have a multi-step design.