PROBLEM TO BE SOLVED: To provide an antimicrobial agent used for an antimicrobial resin composition, an antimicrobial coating composition, and an antimicrobial nonwoven fabric.SOLUTION: The present invention provides an antimicrobial agent (mainly antifungal agent) that comprises a polymer comprising a repeating unit represented by formula [I] (R is H or a methyl group X is-O-, -CO-O-, or -CO-NH-).SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】抗微生物性樹脂組成物、抗微生物性コーティング組成物、および抗微生物性不織布に用いられる抗微生物剤の提供。【解決手段】式〔I〕で表される繰り返し単位を含むポリマーからなる抗微生物剤(主として抗真菌剤)。(RはH又はメチル基;Xは-O-、-CO-O-、又は-CO-NH-)【選択図】なし