PROBLEM TO BE SOLVED: To provide an antimicrobial composition exhibiting sufficient antimicrobial activity to a drink and food even when active components have low concentrations of a degree having no effect on flavor of the food and drink and having a bacteriostatic effect even in relatively high pH range where microorganism or bacteria easily proliferates.SOLUTION: There are provided an antimicrobial composition containing Angelica keiskei chalcone and Vitamin B1 as active ingredients and a method for inhibiting growth of bacteria using the same.SELECTED DRAWING: None