The present invention provides an image forming apparatus in which an imaged sheet is discharged onto a stacking portion (6), comprising a recording means for forming an image on a sheet (S), a discharge means for discharging a sheet on which the image was formed onto the stacking portion (6), a support means (7) disposed downstream of the discharge means in a sheet discharging direction along a width-wise direction of the sheet to be discharged to support one surface of the sheet, and a shift means for shifting the support means between a support position to support the sheet to be discharged above the stacking portion (6) and a retard position not to support the sheet.