An apparatus for continuously forming plate articles which can be installed in a low factory building, which can sufficiently press, heat and dry a mixture of materials, and which can manufacture surface-treated plate articles with high efficiency at a low cost. The mixture is introduced into an introducing chamber, and at the same time, decorative films are fed into the introducing chamber on both sides of the mixture. A semi-finished product made up of the mixture and decorative films are fed between a pair of horizontal hot plates to form it into a strip article. The strip article thus formed is cooled and cut into a plurality of plate articles provided with decorative layers on both sides.