A connector (10) for an apparatus includes a housing (11) having a fit-in part (41) to be fit in a mounting hole (33) that penetrates through a case (30) of the apparatus. Tubular terminal insertion parts (42), penetrating through the fit-in part (41) and can receive a terminal fitting (21) connected with an end of a wire (20). Guide ribs (46A-46C) project from the fit-in part (41) into the case (30) and are spaced apart around an inner peripheral surface of the mounting hole (33). Reinforcing ribs (45A-45D) projecting into the case (30) Each reinforcing rib (45A-45D) and connects a side edge of a guide rib (46A-46C) to a peripheral surface of a terminal insertion part (42).