Problem to be solved: to provide a space sterilizing apparatus which realizes a high sterilization effect even when the relative humidity is low, and realizes a comfortable space which is always sterilized regardless of the relative humidity in the space.Control unit 7A discriminating part 9 for judging the target density of hypochlorous acid in the object space according to the relative humidity of the object space andA volume setting part 10 for setting the volume of the object space andThe hypochlorous acid volatilide determination unit 11 for determining the amount of hypochlorous acid volatilization from the hypochlorous acid target concentration determined by the judging part 9 and the volume of the object space set in the volume setting part 10, andIn accordance with the amount of the hypochlorous acid volatilization determined by the hypochlorous acid volatilide determining section 11, there are provided an electrolytic section 2 and an output decision section 12 for determining the output of the blower 5.Control sectionThe target concentration of the hypochlorous acid concentration of the target space is a target concentration corresponding to the relative humidity of the object spaceWhen the relative humidity of the object space is low, the amount of volatile hypochlorite is increased.AndWhen the relative humidity of the object space is high, the amount of volatile hypochlorite is reduced.Diagram【課題】相対湿度が低い時でも高い除菌効果を発揮し、空間内の相対湿度によらず常に除菌された快適な空間を実現する空間殺菌装置を提供する。【解決手段】制御部7は、対象空間の相対湿度に応じた前記対象空間の次亜塩素酸目標濃度を判定するための判定部9と、前記対象空間の容積を設定するための容積設定部10と、判定部9で判定された次亜塩素酸目標濃度と容積設定部10で設定された前記対象空間の容積から次亜塩素酸揮発量を決定する次亜塩素酸揮発量決定部11と、次亜塩素酸揮発量決定部11で決定された次亜塩素酸揮発量に応じて電解部2と送風機5の出力を決定するための出力決定部12とを備え、制御部7が、前記対象空間の次亜塩素酸濃度が前記対象空間の相対湿度に応じた目標濃度となるように、前記対象空間の相対湿度が低い時には次亜塩素酸揮発量を増加させ、また、前記対象空間の相対湿度が高い時には次亜塩素酸揮発量を減少させる。【選択図】図3