Cationic electrodeposition coating composition

A cationic electrodeposition coating composition comprising an amino group-containing epoxy resin (A), a blocked polyisocyanate compound (B), and crosslinked epoxy resin particles (C), wherein:

• the crosslinked epoxy resin particles (C) are contained by 0.1 to 40 parts by mass relative to a total mass in solids content of the amino group-containing epoxy resin (A) and blocked polyisocyanate compound (B);
• a number-average molecular weight of the crosslinked epoxy resin particles (C) is under 100,000;
• and/or
• a volume-average particle size of the crosslinked epoxy resin particles (C) is 30 to 1,000 nm,
• said number-average molecular weight being a value determined as measured by a method wherein the crosslinked epoxy resin particles (C) are diluted with N,N′-dimethylformamide to 1% by mass in solids content concentration and let stand stationary for 24 hours at room temperature;
• next, undissolved components are filtered out;
• and the number-average molecular weight is measured by gel permeation chromatography (GPC).