PROBLEM TO BE SOLVED: To provide a hypochlorous acid aqueous solution having excellent bacterial effect and safety.SOLUTION: Provided is a hypochlorous acid aqueous solution having a pH of 6.3 to 6.7 being an antimicrobial agent of bacillus spore in which the effective chlorine concentration in the aqueous solution is 280 to 320 ppm. Also provided is a bactericidal method of bacillus subtilis spore characterized in that a member as an object for germicidal treatment is immersed into the antimicrobial agent for 0.5 to 4 min. Also provided is an antibacterial agent being a hypochlorous aqueous solution having a pH of 6.4, in which the effective chlorine concentration in the aqueous solution is 0.5 to 200 ppm. Also provided is an antibacterial treatment method characterized in that a member as an object for antibacterial treatment is immersed into the antibacterial agent for 0.5 to 10 min.SELECTED DRAWING: None【課題】 本発明は、優れた殺菌効果と安全性とを有する、次亜塩素酸水溶液を提供することを目的とする。【解決手段】 ｐＨ６．３～６．７の次亜塩素酸水溶液であって、前記水溶液中の有効塩素濃度が２８０～３２０ｐｐｍであるバチルス芽胞の殺菌剤、及び前記殺菌剤中に、殺菌処理の対象となる部材を０．５～４分間浸漬することを特徴とする、バチルス・ズブチリスの芽胞の殺菌方法を提供する。また、ｐＨ６．４の次亜塩素酸ナトリウム水溶液であって、前記水溶液中の有効塩素濃度が０．５～２００ｐｐｍである抗菌剤、及び前記抗菌剤中に、抗菌処理の対象となる部材を０．５～１０分間浸漬することを特徴とする、抗菌処理方法を提供する。【選択図】 なし
