PROBLEM TO BE SOLVED: To provide a sterilization method that retains the sterilization performance of a cationic sterilizer and also improves the permeability of the sterilizer into a biofilm.SOLUTION: The present invention provides a sterilization method that retains the sterilization performance of a cationic sterilizer by containing an amphoteric surfactant and also improves the permeability of the sterilizer into a biofilm.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】カチオン性殺菌剤の殺菌性能を保持しつつ、殺菌剤のバイオフィルムへの浸透性を向上させる殺菌方法を提供する。【解決手段】両性界面活性剤を含有することによりカチオン性殺菌剤の殺菌性能を保持しつつ、バイオフィルムへの浸透性を向上させることを特徴とする殺菌方法。【選択図】なし