A sheet metal member has a first through hole formed at such a position as to be in communication with a screw hole formed in a side surface of a panel, and is fixed to the panel by being screwed using the first through hole and the screw hole. The sheet metal member further has hole a bending piece in which a second penetration is formed and on which a bending processing is performed at such an overlapping position that the second through hole overlaps with the first through hole, and is screwed to the panel in either of, according to a type of the panel, an open state in which the bending processing has not yet been performed on the bending piece or a bent state in which the bending processing has been performed on the bending piece at the overlapping position.