 from (a) about 00-00% by weight of a cationic electrodeposition synthetic resin produced by an epoxy-amino addition reaction (b) about 0-00% by weight of an acrylic cationic electrodeposition resin having an amino group (c) about 0-0% by weight of a fatty acid ester resin synthesized by an esterification reaction of styrene-allylalcohol copolymer and fatty acid and (d) about 00-00% by weight of polyurethane cross-linking agent produced from a mixture of blocked polymethylene polyphenyl polyisocyanate and blocked isophorone diisocyanate. A