PROBLEM TO BE SOLVED: To provide a bactericidal copper material having high sterilization characteristics and effectively carrying out sterilization.SOLUTION: The copper material that is cold-worked and is not heat-treated after cold working is brought into contact with a liquid to sterilize germs in the liquid.COPYRIGHT: (C)2010,JPO&INPIT【課題】殺菌特性が高く、効果的に殺菌が可能な殺菌性銅素材を提供すること。【解決手段】冷間加工が施され、冷間加工後の熱処理が施されない銅素材を、液体に接触させて液体中の菌を殺菌することを特徴とする。【選択図】図4