PROBLEM TO BE SOLVED: To provide antibacterial methods with high versatility.SOLUTION: Antibacterial methods include a step of applying light containing purple light that has a luminescence peak which half width is not more than 20 nm, and the peak wave-length of the luminescence peak is in an area of 380-410 nm.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT【課題】汎用性の高い抗菌方法などを提供する。【解決手段】抗菌方法は、半値幅が20nm以下である発光ピークを有し、当該発光ピークのピーク波長が380nm以上410nm以下の範囲に含まれる紫色光を含む光を菌類に照射する工程を含む。【選択図】図4