<;P>;PROBLEM TO BE SOLVED: To provide an antimicrobial agent composition which is high in safety and exhibits an excellent antimicrobial action. <;P>;SOLUTION: This antimicrobial composition contains the following ingredients (A) and (B): (A) ethanol 5 to 50 mass%, (B) catechin compounds 0.00625 to 0.2 mass%. <;P>;COPYRIGHT: (C)2009,JPO&INPIT