To provide a backplate for receiving self-weight of a wall panel capable of placing the wall panel in which a groove is formed at a butt end in a bottom part on a panel support frame body such as a receive plate without damaging it for a long time.

This backplate for receiving self-weight of a wall panel is provided with a groove loading part 19 formed in such a way that its cross section is one-end opened square by copying a shape of a groove formed at a butt end of the wall panel, a panel receive part 20 which overhangs from an end part of the groove loading part 19 and is formed by copying an end face of the butt end, a protruding part 21 which is placed on a panel support body such as a receive plate and has a lower end whose cross section is formed like arc, and a locking part 22 locking on the panel.