To prevent a synthetic resin from peeling by arranging an unstuck part of a synthetic resin film to an edge part of a metal plate and subjecting a metal plate to roll forming so that a forming roll presses down an edge of a synthetic film at edge part forming.

An unstuck part of a synthetic resin film is arranged to a whole length of an edge part of a metal plate, an edge part of a synthetic film laminated metal plate is roll formed. An unstuck part of the synthetic resin film arranged to a whole length of an edge part of the metal plate is made to about 5-15 mm width, a forming roll can press an edge of the synthetic resin film. An unstuck part of an edge part whole length of the metal plate is made by sticking a protective film having a width narrower than a width of the metal plate or simultaneously sticking in forming with arranging a laminating device. Embossing is arranged to the metal plate, the synthetic resin film is not peeled even when a stress is caused to the synthetic resin film, because the projecting part is strongly pressed with a forming roll.