An image forming apparatus including a sheet loader, the sheet loader including: a discharger configured to discharge a first sheet and a second sheet after the first sheet; a tray configured to support the second sheet on the first sheet; a support configured to support the first sheet on the tray; a controller configured to control the support to lower a first angle than a second angle, the first angle being an angle of the first sheet against a direction to which the discharger discharges the second sheet at a position where the second sheet hits on the first sheet, the second angle being an angle of the tray against the direction at a position where the first sheet hits on the tray.