PROBLEM TO BE SOLVED: To provide an air purifying device in which a bactericide solution comes into contact with bacteria in the air to execute disinfection.SOLUTION: An air purifying device includes: a housing 50 having an air passage 52 through which air to be disinfected 51 flows from upstream to downstream； a spray device 53 which sprays a bactericide solution into the air to be disinfected which flows through the air passage 52； a circulation reservoir 54 for receiving the bactericide solution falling from the air passage 52； a circulation system 55 for supplying to the spray device the bactericide solution of the circulation reservoir 54； a drug supply device 56 for supplying slightly acidic electrolysis water as the stock solution of the bactericide solution to the circulation system of the bactericide solution which is formed by the circulation reservoir 54, the circulation system 55, the spray device 53 and the air passage 52； and a diluent system 571 for supplying diluent used to dilute the bactericide solution.【課題】殺菌剤溶液が空気中において菌と気液接触して殺菌を行なう空気清浄装置を提供する。【解決手段】除菌対象空気５１が上流側から下流側に流れる通気路５２を有するハウジング５０と、前記通気路５２を流れる除菌対象空気に殺菌剤溶液を噴霧する噴霧装置５３と、前記通気路５２から降下する殺菌剤溶液を受け止める循環槽５４と、循環槽５４の殺菌剤溶液を噴霧装置に供給する循環系５５と、循環槽５４と循環系５５と噴霧装置５３と通気路５２とで形成される殺菌剤溶液の巡廻系に殺菌剤用液の原液として微酸性電解水を供給する薬剤供給装置５６と、殺菌剤溶液を希釈する希釈水を供給する希釈水系５７１を備える。【選択図】図１
