PROBLEM TO BE SOLVED: To provide an antiviral antibacterial coating agent having durability applicable to practical use as business use or domestic use.SOLUTION: This coating agent to be sprayed to an acrylic resin surface includes 0.8-4.1 wt.% octadecyl dimethyl(3-trimethoxysilylpropyl)ammonium chloride, 0.25-2.0 wt.% didecyldimethylammonium chloride, 0.25-2.0 wt.% 3-methacryloxy propyl trimethoxysilane, and a volatile solvent as the residue. Didecyldimethylammonium chloride works as an antiviral antibacterial accelerator, and 3-methacryloxy propyl trimethoxysilane works as an adhesion enhancer for securing adhesion onto the acrylic resin surface of octadecyl dimethyl trimethoxysilylpropylammonium chloride, to thereby show antiviral antibacterial properties for a long period.
