PROBLEM TO BE SOLVED: To provide an air purification device for adjusting the amount of hypochlorous acid gas generated according to an application. SOLUTION: In an air purification device for sterilizing air passing through a gas-liquid contact member 7 with hypochlorous acid, a pH adjusting agent charging device 23 for charging a pH adjusting agent into a storage unit 13 and an operation mode are used. The operation switch 15 to be set and the control unit 14 for operating the pH adjuster input device 23 according to the operation switch 15 are provided, and the pH adjuster input device 23 holds an alkaline pH adjuster and an acidic pH adjuster. The control unit 14 puts at least one of the alkaline pH adjuster and the acidic pH adjuster into the storage unit 13 in accordance with the operation mode set by the operation switch 15, and the pH in the storage unit 13 is adjusted. The operation mode can be adjusted to a predetermined value, and the operation mode is an operation mode in which at least the solution containing hypochlorite in the reservoir 13 is prepared between pH 6 and pH 7, and an operation in which the solution is prepared between pH 8 and pH 9. Equipped with a mode. [Selection diagram] Fig. 2【課題】用途に応じて次亜塩素酸ガスの発生量を調節する空気浄化装置を提供する。【解決手段】気液接触部材７を通過した空気を次亜塩素酸で殺菌する空気浄化装置において、貯留部１３内にｐＨを調製する薬剤を投入するｐＨ調製剤投入装置２３と、運転モードを設定する操作スイッチ１５、操作スイッチ１５に合わせてｐＨ調製剤投入装置２３を動作させる制御部１４とを備え、ｐＨ調製剤投入装置２３は、アルカリ性のｐＨ調製剤及び酸性のｐＨ調製剤を保持しており、制御部１４は、操作スイッチ１５によって設定された運転モードに合わせて、前記アルカリ性のｐＨ調製剤と酸性のｐＨ調製剤の少なくとも一方を貯留部１３に投入し、貯留部１３内のｐＨを所定の値に調製できるものであり、前記運転モードは少なくとも貯留部１３内の次亜塩素酸を含む溶液をｐＨ６からｐＨ７の間へ調製する運転モードと、ｐＨ８からｐＨ９の間に調製する運転モードを備えた。【選択図】図２
