PROBLEM TO BE SOLVED: To provide a germicidal composition for bacterial skin diseases in which bacteria causing bacterial skin diseases are difficult to obtain drug resistance. SOLUTION: The silver iodide, which is a nanoparticle having a particle diameter of 1 nm to 100 nm, an iodide ion, a water-soluble polymer, an organic acid having a carboxyl group and / or a salt thereof, A germicidal composition for bacterial skin diseases, wherein the molar ratio of silver in silver to the iodide ion is from 1: 1 to 1: 1000. [Selection] Figure 1【課題】 細菌性皮膚病を引き起こす細菌が薬剤耐性を獲得しづらい細菌性皮膚病用殺菌組成物を提供する。【解決手段】 粒径が１ｎｍ以上１００ｎｍ以下のナノ粒子であるヨウ化銀と、ヨウ化物イオンと、水溶性高分子と、カルボキシル基を有する有機酸および／またはその塩とを含み、前記ヨウ化銀中の銀と前記ヨウ化物イオンとのモル比が１：１～１：１０００であることを特徴とする細菌性皮膚病用殺菌組成物。【選択図】図１
