A disinfectant contains the following components (a), (b), (c) and (d), and free of other sterilizer-disinfectants that are for sterilizing and disinfection purposes: (a) ethanol, iso propylalcohol, or a mixture thereof, in the amount of 40~90% (w/w) with respect to the entire disinfectant, (b) lactic acid, in the amount of 0.1~2% (w/w) with respect to the entire disinfectant, (c) citric acid in the amount of 0.01-2% (w/w) with respect to the entire disinfectant, and (d) a zinc-containing compound which liberates zinc ions in a solution, in the amount of 0.001~0.1% (w/w) with respect to the entire disinfectant.本發明提供一種含下列(a)、(b)、(c)及(d)且不含其他以殺菌消毒為目的之殺菌消毒劑的消毒劑，(a)對消毒劑全體而言，含有40至90重量%之乙醇、異丙醇，或該等之混合物，(b)對消毒劑全體而言，含有0.1至2重量%之乳酸，(c)對消毒劑全體而言，含有0.01至2重量%之檸檬酸，(d)對消毒劑全體而言，含有0.001至0.1重量%之在溶液中會解離鋅離子的含鋅化合物。
