A cationic electrodeposition coating composition comprising[A] a neutralization product or a quaternary ammonium salt of a comb-shaped copolymer obtained by copolymerizing (a) 3 to 90 parts by weight of an ethylenically unsaturated monomer having a hydrocarbon chain with at least 8 carbon atoms at the molecular ends, (b) 1 to 50 parts by weight of at least one cationic (meth)acrylic monomer selected from the group consisting of aminoalkyl (meth)acrylates, aminoalkyl (meth)acrylamides (meth)acrylates containing a quaternary ammonium salt group and (meth)acrylamides containing a quaternary ammonium salt group, (c) 1 to 60 parts by weight of an alpha,beta-ethylenically unsaturated monomer other than the monomer (b), and (d) 0 to 95 parts by weight of an alpha,beta-ethylenically unsaturated monomer other than the monomers (a), (b) and (c),[B] a cationic epoxy resin capable of being dissolved or dispersed in water, and[C] a pigment.