A connector (F) includes a housing (10) formed with terminal accommodating chambers (11) in multiple stages in a vertical direction. Locking lances (12) cantilever forward along lower wall surfaces of the terminal accommodating chambers (11), and terminal fittings (30) are retained by the locking lances (12). Deflection spaces (13, 13E) allow the locking lances (12) to be resiliently deflected. Horizontal plate-like functional portions (21, 21E) are formed on a front retainer (20) and are insertable into the deflection spaces (13, 13E). A supporting plate (14) is cantilevered forward along a lower surface of the lowermost plate-like functional portion (21, 21E) and constitutes an outer wall of the housing (10). Reinforcing ribs (15, 15E) and (16) are formed on the supporting plate (14) and are configured to enhance flexural rigidity of the supporting plate (14).