To continuously produce a metal plate made wall plate material wherein a foamed resin core material is filled into a groove-shaped metal plate made groove-shaped surface material to which a rugged pattern deep in depth is applied and a rear surface material is coated on the rear surface of the core material.

A metal plate 1aa which is continuously uncoiled from an uncoiler 11 is deflected into a loop shape, a die provided with a press forming part which applies a rugged pattern of ≥2 mm in depth in a prescribed position where an exposed surface part is formed as a wall surface is intermittently transferred by a press length each at a time to a press device 6 which vertically moves in a fixed position to press form. After the metal plate is deflected into the loop shape again, both side edge parts are bent to form a surface material 1a having a groove-shaped section and a fitting part of mutually fitting male and female dies, a foamable resin 3a is poured into the groove of the surface material 1a, its rear surface side is coated with a rear surface material 1f, the foamable resin 3a is foamed and cured, and the foamed resin core material is filled into the groove of the surface material 1a.