To provide a folding panel which makes it easy to stick a skin material on the entire surface with the panel opened to make its surface flat and is free from troubles in which the panel can not be opened completely, or the skin material is peeled partially.

End surfaces on the side of the joint between one panel 2 and the other panel 3 are made inclined surfaces 9 and 10 inclining respectively from the surface fringes 7 to the back fringes of the panels. A support 14 is installed in a space 13 which is generated between the end surfaces on the joint side when the backs 11 and 12 of the panels 2 and 3 are brought together. The surface fringe 7 of the panel 2 and the surface fringe 15 of the support 14 are connected by a hinge 17, and the surface fringe 7 of the panel 3 and the surface fringe 16 of the support 14 are connected by a hinge 18 to form the folding panel 4.