PROBLEM TO BE SOLVED: To provide a method for manufacturing an antimicrobial composition that is highly soluble in water.SOLUTION: The method includes a step in which (A) a phenolic antimicrobial agent and (B) a polyol are heat-treated at 110-180°C in the presence of an aqueous medium.【課題】水への溶解性に優れる抗菌剤組成物を製造する方法の提供。【解決手段】水性媒体の存在下、(A)フェノール系抗菌剤と(B)ポリオールを110~180℃で加熱処理する工程を含む抗菌剤組成物の製造方法。【選択図】なし