PROBLEM TO BE SOLVED: To provide a hypochlorous acid-based aqueous solution having excellent stability of effective chlorine concentration and pH. SOLUTION: The pH is in the range of 4 to 7, including hypochlorous acid or a salt thereof, carbon dioxide gas, and water having a conductivity of 1 mS / m or less and total organic carbon of 0.1 mg / L or less. It is a hypochlorous acid-based aqueous solution having an effective chlorine concentration in the range of 50 to 300 mg / L and contained in an aluminum pouch container. [Selection diagram] None【課題】有効塩素濃度およびｐＨの安定性に優れる次亜塩素酸系水溶液を提供する。【解決手段】次亜塩素酸またはその塩と、炭酸ガスと、導電率が１ｍＳ／ｍ以下、全有機炭素が０．１ｍｇ／Ｌ以下である水と、を含み、ｐＨが４～７の範囲であり、有効塩素濃度が５０～３００ｍｇ／Ｌの範囲であり、アルミパウチ容器に収容されている、次亜塩素酸系水溶液である。【選択図】なし
