A watertight connector has a housing (10) with terminal fittings (11) therein. A busbar element (14) is mounted on the front of the housing (10) to short the terminal fittings (11). The busbar element (14) engages engageable portions (22; 23) formed by a mold removing space (24) in the housing (10). A rubber plug (12) and a plug holder (13) are assembled with the housing (10) by engaging locks (25) on the plug holder (13) with the housing (10). The locks (25) are inserted into the mold removing spaces (24). The locks (25) and the engageable portions (22, 23) overlap in width and/or height directions to miniaturize the watertight connector.