To make a cured object of a raw material mat hard to adhere to the rear surface of a feed panel on which a template permitting the foaming of the raw material mat is placed integrally or separately in such a case that a wooden cement panel is produced.

A thick-walled outer side part 2 is formed on a template 1 and a raw material mat 4 is foamed on the template 1 to be placed on a feed panel 5 integrally or separately. When a plurality of the feed panels 1 are stacked, the raw material mat 4 corresponding to the thick-walled outer side part 2 of each of the feed panels 1 is largely compressed as compared with other part to become easy to adhere to the rear surface of each of the feed panels 5 but a brushing treatment part 5A is provided on the rear surface of each of the feed panels 5 at this part to prevent the adhesion of the raw material mat.