A charging device includes a corona charger including a grid electrode, a cleaning member configured to clean the grid electrode, a sheet-type shutter configured to open/close an opening of the corona charger, and a drive source configured to drive both the cleaning member and the shutter in a longitudinal direction of the corona charger, wherein the cleaning member is provided such that a cleaning ability thereof is higher in a case where the cleaning member and the shutter are moved in a closing direction of the opening of the corona charger than in a case where the cleaning member and the shutter are moved in an opening direction of the opening of the corona charger.