An image forming apparatus , comprising: a sheet feeding portion configured to feed a sheet to a sheet conveying path ; an image forming portion configured to form an image on the sheet which is guided along the sheet conveying path ; a sheet discharging portion configured to discharge the sheet on which the image has been formed by the image forming portion ; a discharged sheet stacking portion provided above the image forming portion and on which the sheet is discharged; a sheet re-conveying path configured to guide again, to the sheet conveying path , the sheet on which the image has been formed by the image forming portion ; an original stacking portion provided above the image forming portion and on which an original is stacked; an original feeding portion provided above the image forming portion , and configured to feed the original stacked on the original stacking portion ; an original feeding path configured to guide, to the sheet re-conveying path , the original which has been fed by the original feeding portion ; an image reading portion configured to read an image of the original which has been fed by the original feeding portion ; a discharged original stacking portion provided above the image forming portion and on which the original is discharged; an original discharging portion provided above the image forming portion , and configured to discharge the original which has been read by the image reading portion to the discharged original stacking portion ; an original discharging path configured to guide, to the original discharging portion , the original which has been guided along the sheet re-conveying path ; and an original conveying portion configured to convey the original which has been guided along the original feeding path toward the original discharging path , wherein the discharged sheet stacking portion , the original stacking portion and the discharged original stacking portion overlap one another. a sheet feeding portion configured to feed a sheet to a sheet conveying path ; an image forming portion configured to form an image on the sheet which is guided along the sheet conveying path ; a sheet discharging portion configured to discharge the sheet on which the image has been formed by the image forming portion ; a discharged sheet stacking portion provided above the image forming portion and on which the sheet is discharged; a sheet re-conveying path configured to guide again, to the sheet conveying path , the sheet on which the image has been formed by the image forming portion ; an original stacking portion provided above the image forming portion and on which an original is stacked; an original feeding portion provided above the image forming portion , and configured to feed the original stacked on the original stacking portion ; an original feeding path configured to guide, to the sheet re-conveying path , the original which has been fed by the original feeding portion ; an image reading portion configured to read an image of the original which has been fed by the original feeding portion ; a discharged original stacking portion provided above the image forming portion and on which the original is discharged; an original discharging portion provided above the image forming portion , and configured to discharge the original which has been read by the image reading portion to the discharged original stacking portion ; an original discharging path configured to guide, to the original discharging portion , the original which has been guided along the sheet re-conveying path ; and an original conveying portion configured to convey the original which has been guided along the original feeding path toward the original discharging path , wherein the discharged sheet stacking portion , the original stacking portion and the discharged original stacking portion overlap one another. <EOS>