Abstract: The present invention provides an antibacterial lead-free cationic electrodeposition coating composition comprising an aqueous medium, a binder resin including a cationic epoxy resin and a blocked isocyanate curing agent which is dispersed or dissolved in the aqueous medium, a neutralizing acid for neutralizing the cationic epoxy resin, an organic solvent and an antibacterial agent, wherein a volatile organic content is not more than 2% by weight, and the antibacterial agent is an isothiazolone compound. The antibacterial lead-free cationic electrodeposition coating composition of the present invention has reduced VOC and lead ion content in order to exert small influence on the environment, whereas having antibacterial ability comparable to that before reducing VOC and lead ion content, and having excellent electrodeposition performance.