An image forming apparatus is provided with an image forming section to form an image on a sheet and to discharge the sheet on which the image is formed; a stacking section to stack the sheet discharged from the image forming section; a setting section to set a condition whether or not to allow a mixed stack mode on which plural sheets related to at least two different jobs are mixed and stacked in the stacking section; and a discharge control section to control the image forming section to discharge the sheet to the stacking section in accordance with the setting condition whether or not to allow the mixed stack mode.
