Terminal fittings (110) connected to end parts of wires (200) are inserted into cavities (16) of a housing (11). A seal (60) is arranged on a rear surface side of the housing (11), and a holder (40) is arranged on a rear side of the seal (60). A wire cover (70) is arranged rotatably from an open position to a closed position on a rear side of the holder (40). The wire cover (70) includes cover-side rotation center portions (76). The holder (40) includes holder-side rotation center portions (47) configured to support the cover-side rotation center portions (76) and constituting a center of rotation of the wire cover (70).