PURPOSE: To obtain a composite metallic plate for ornamentation having more varied and regular patterns by superposing plural kinds of metallic plates or square wire rods having different colors as specified and uniting the same to one body by diffusion welding then cutting the plate at a prescribed width.

CONSTITUTION: For example, three kinds of metallic plates A, B, C having different color tones are superposed on each other and are joined to one body by diffusion welding, by which the 1st cladding material 1 is obtd. The material 1 is cut along the plane at an optional angle, for example, perpendicular to each mating face of the above-mentioned blank metallic plate to obtain partially the 1st metallic plate 2 having the cut end face where the cut ends of the material 1 are layered. The plates 2 are then superposed on each other in such a way that ≥1 kinds of the end faces among the end faces of the respective blank metallic plates appearing on the cut end face of the plate 2 form a prescribed pattern. The superposed plates are joined to one body by diffusion welding, by which the 2nd cladding material 3 is obtd. The material is finally cut along the plane perpendicular to each mating face of the plate 2 and the composite metallic plate 4 having the stripe pattern where the respective square cut ends of the materials A, B, C are continuous in parallel in the respective diagonal directions is obtd.