To provide a resin panel having a sandwich structure, the resin panel being lightweight and highly rigid, and allowing an external accessory to be reliably affixed thereto.

A resin panel having a sandwich structure comprises a core material having a through-hole penetrating through the thickness thereof, two resin sheets 14, 16 respectively secured to the surfaces of the core material, and a pair of screw receiving materials secured to each other so as to sandwich the peripheral edges of the through-hole. A screw receiving hole extending in the thickness direction in the through hole from its surface is formed at least any one of the pair of screw receiving materials, enabling a screw to be screwed from outer surfaces 36 of the resin sheets 14, 16 into the screw receiving hole and to be affixed thereto.