To uniformly coat a deep draw forming part of a woody fiber plate by bringing a plastic sheet into close contact with a surface of a woody fiber plate molding attached on its surface with embossed pattern along a molding shape by copying the pattern.

A plastic sheet 10 is superposed on an embossed woody fiber plate molding 1A, and adhered to the molding 1A. This adhering method, for example, thermally softens the sheet 10 or coats the sheets 10 with adhesive. The sheet 10 may be used as a decorative material as it is or the surface of the sheet 10 may be coated. In this case, a primary coating film 11 formed on the surface of the sheet 10, the surface of the molding 1A is wiped in an undried state, and a top coating film 12 is formed thereon. The top coating paint is pale color as compared with the primary coating paint so as to see through color of the film 11 embedded in an embossed recess part D such as, for example, woodgrain pattern.