A protector includes a main body, lids, hinges, and lock portions. The main body including a bottom wall, a first sidewall, and a second sidewall. The lids are coupled to the main body through the hinges. The lock portions are disposed between the lids and the main body. The lids are configured to cover the main body from both sides thereof. A first lid includes a closure plate at an adjacent position thereof. The closure plate protrudes from an end portion of the first lid toward an inner surface side of the second lid. The closure plate closes gap between the first and second lids. A second lid includes a misassembly prevention rib at an adjacent position thereof. The rib protrudes from an end portion of an outer surface of the second lid toward a direction away from the bottom wall.