A connector (10) to be mounted in a metallic transmission case (C) has a base housing (20). Terminal fittings (40) have a wire connecting portion (41) and a terminal connecting portion (42) arranged in an L-shape. The terminal connecting portions (42) are inserted through the base housing (20) and the wire connecting portions (41) are arranged side by side on the base housing (20). A cover housing (30) is assembled with the base housing (20) to cover the wire connecting portions (41). Lock projections (22) and lock pieces (31) lock the cover housing (30) and the base housing (20) together. A wall (33) projects from the cover housing (30) toward the base housing (20) between adjacent wire connecting portions (41); and a groove (26) is provided in the base housing (20) at a position corresponding to the wall (33) and into which the wall (33) is press-fit.