A mildew-proofing composition of this invention contains a haloethyne compound, an isothiazolin compound (but excluding 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one and n-1,2-benzisothiazolin-3-one) and two or more of triazole compounds (but excluding combination of propiconazole and tebuconazole, combination of propiconazole and azaconazole, combination of hexaconazole and tebuconazole, combination of hexaconazole and azaconazole, and combination of tebuconazole and azaconazole).本發明之防黴組成物是含有鹵乙炔化合物、異噻唑啉化合物(但是,排除4,5-二氯-2-正辛基-4-異噻唑啉-3-酮及正丁基-1,2-苯并異噻唑啉-3-酮)及2種以上的三唑化合物(但是,排除丙環唑與戊唑醇的組合、丙環唑與阿扎康唑的組合、己唑醇與戊唑醇的組合、己唑醇與阿扎康唑的組合、戊唑醇與阿扎康唑的組合)。
