An image forming apparatus includes an image forming mechanism configured to form an image and transfers the image on a sheet member, and a sheet processing unit (2). The sheet processing unit (2) includes a sheet aligning unit (6), an ejection sheet tray (4) configured to stack the sheet member, a sheet stopper (7) configured to align the sheet member at a trailing edge thereof, a return mechanism (5) configured to return the sheet member stacked on the ejection sheet tray (4) to the sheet stopper (7), and a discharging mechanism (9) configured to discharge the sheet member, aligned by the return mechanism (5), from the sheet stopper (7) to the ejection sheet tray (4). The sheet aligning unit (6) includes a stacking mechanism configured to stack the sheet member transferred into the sheet aligning unit, and a sheet aligning mechanism configured to align the sheet member.
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