The purpose of the present invention is to provide an antibacterial/antiviral coating agent capable of forming an antibacterial/antiviral coating film that can maintain an excellent appearance. This antibacterial/antiviral coating agent includes acrylic melamine paint, a quaternary ammonium salt, polyvalent carboxylic acid, and phosphoric acid； the quaternary ammonium salt is included at over 3.0 parts by weight and under 5.0 parts by weight to 100 parts by weight of acrylic melamine paint solids, and the phosphoric acid is included at a mole ratio of 0.5-3.5 to the quaternary ammonium salt.
