NOVELTY - An oxide layer containing oxide of group 4 metal and/or group 5 metal is formed on a substrate containing metal of group 4 and/or group 5 by a thermal decomposition method, a coating liquid containing an alcohol solution of platinum-containing group metallic compound is applied, dried, and baked, to form a platinum group metal content layer and/or its oxide layer on the oxide layer. A platinum group metal plating layer is formed on the platinum group metal content layer and/or its oxide layer, to obtain corrosion-resistant electroconductive coating material.    USE - Manufacture of corrosion-resistant electroconductive coating material used for metal-plating apparatus, electrochemical reaction tank and electrode for dye-sensitized solar cell. Uses include but are not limited to terminal for electric power feeding, rool, polymer electrolytic fuel cell separator and electrolytic cell.    ADVANTAGE - The method enables effective manufacture of electroconductive coating material having excellent electroconductivity, durability and corrosion resistance, and improved adhesiveness of metal substrate and platinum group metal plating layer. The electroconductive coating material exhibits favorable power generation characteristics with high conductor characteristics.    DETAILED DESCRIPTION - An oxide layer containing oxide of group 4 metal and/or group 5 metal is formed on a substrate containing metal of group 4 and/or group 5 by a thermal decomposition method, a coating liquid containing an alcohol solution of platinum-containing group metallic compound is applied, dried, and baked, to form a platinum group metal content layer and/or its oxide layer on the oxide layer. A platinum group metal plating layer is formed on the platinum group metal content layer and/or its oxide layer, to obtain corrosion-resistant electroconductive coating material. The calcination temperature in the process of forming platinum group metal layer and/or its oxide layer is 350-600 degrees C.