▎ 摘　　要

NOVELTY - A metal material (1) comprises electroconductive coating (20) which is formed on the surface of metallic substrate (10), electroconductive polymeric layer (21) which is formed in contact with metallic substrate, and graphene layer (22) which is formed on electroconductive polymeric layer. USE - A metal material for connector used as electrical contact material, and for civil engineering or building structure and machine component (all claimed). ADVANTAGE - The metal material has improved oxidation resistance and corrosion resistance and maintains high electroconductivity. DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory view of the laminated structure of metal material. Metal material (1) Metallic substrate (10) Electroconductive coating (20) Electroconductive polymeric layer (21) Graphene layer (22)