PROBLEM TO BE SOLVED: To provide an antimicrobial agent composition having superior antimicrobial effect and high safety to human body.SOLUTION: The antimicrobial agent composition includes glycyrrhetinic acid or its derivative and an aluminum salt. There is further disclosed an antimicrobial agent against Corynebacterium microorganisms containing glycyrrhetinic acid or its derivative as an active component.COPYRIGHT: (C)2012,JPO&INPIT【課題】優れた抗菌効果を有し、人体に対する安全性の高い抗菌剤組成物の提供。【解決手段】グリチルレチン酸又はその誘導体、及びアルミニウム塩を含有する抗菌剤組成物。グリチルレチン酸又はその誘導体を有効成分とするコリネバクテリウム属菌に対する抗菌剤。【選択図】なし