A lever-type connector has a lever (30) rotatably supported on support shafts (22) on outer side surfaces of side walls (21) of a wire cover (20). Guide ribs (14) are formed on outer surfaces of a first housing (10) and extend parallel to an assembling direction of the wire cover (20). Guide grooves (24) are formed in inner surfaces of the side walls (21) and are engageable with the guide ribs (14). Two housing-side lock projections (16) on the outer surface of the first housing (10) and two cover-side lock projections (27) on the inner surface of the side wall (21) are arranged to be located respectively at opposite sides of the guide rib (14) and at opposite sides of the guide groove (24) in a direction substantially parallel to the side wall (21) and intersecting the assembling direction of the side wall (21).