A paper output tray, which can be included in a paper output unit in an image forming apparatus, includes a tray body, a paper support extension slidably attached to the tray body and arranged switchable between a stored state in which the paper support extension is stored in the tray body and an extended state in which the paper support extension is pulled out to extend from the tray body, and a stopper rotatably attached to the paper support extension and arranged switchable between a folded state in which the stopper is folded to the paper support extension and a standing state in which the stopper is raised from the paper support extension. With the paper support extension in the stored state and the stopper in the folded state, the stopper overlaps an outer surface of the tray body.
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