A post-processing device includes: a stacking section that stacks a sheet; an output section that outputs the sheet stacked on the stacking section; a facing section that is arranged to face an end portion of the stacked sheet on an upstream side in an output direction; a movable support section that is provided to be movable from the stacking section toward a downstream side in the output direction of the stacked sheet, and when the stacked sheet is outputted from the stacking section, supports the stacked sheet with the stacking section; and a pressing section that is provided in the movable support section to face an end portion of the stacked sheet on the downstream side in the output direction, and presses the stacked sheet against the facing section with movement of the movable support section.