<;P>;PROBLEM TO BE SOLVED: To provide an antibacterial agent which excels in antibacterial properties, and has reactivity to various substrates, especially to a polyvinyl alcohol-based resin. <;P>;SOLUTION: The antimicrobial agent contains zinc glyoxylate as an active ingredient. In addition, the antibacterial resin composition includes the antibacterial agent. <;P>;COPYRIGHT: (C)2011,JPO&INPIT