Provided in the present invention is a laminated plate in which a thin aluminum alloy plate having a remarkably lowered forming limit is laminated on each of the two sides of a core polypropylene based resin having foamable property which has inferior formability and shape stability, and which is able to be subjected to forming and is excellent in shape stability after this forming. A laminated plate 1 according to the present invention is one in which aluminum alloy plates 2a and 2b are laminated on each of the two sides of a core polypropylene based resin 3a having foamable property, and after forming, the core polypropylene based resin 3a having foamable property is foamed by heating, thereby forming a composite formed article. A plate thickness of this plated plate 1 is thin. Also, the aluminum alloy plates 2a and 2b and the core polypropylene based resin 3a having foamable property which constitute this laminated plate are each constituted so as to have a thin plate thickness. Furthermore, the aluminum alloy plates 2a and 2b are a temper treated material selected from an O material, an H22 material to an H24 material, an H32 material to an H34 material and a T4 material.