Patent ID: 8905394

Claim:
A sheet post-processing apparatus comprising: a conveyance unit configured to convey a sheet; a sheet stacking unit configured to stack sheets conveyed by the conveyance unit as a sheet bundle; a stapler configured to apply a staple process to the sheet bundle stacked on the sheet stacking unit; a position determination unit configured to determine a staple position at which the staple process is applied to the sheet bundle; and an alignment unit configured to align the sheets stacked on the sheet stacking unit in a width direction that intersects perpendicularly with a conveyance direction of a sheet conveyed by the conveyance unit with respect to one of two sides of the sheet that are parallel to the sheet conveyance direction, the alignment unit determining the one side as a reference side depending on the staple position determined by the position determination unit, wherein the alignment unit comprises: a first alignment member and a second alignment member each movable in the width direction; and a pushing unit separate from the first and second alignment members and configured to selectively push, on the basis of the staple position determined by the position determination unit, the sheet toward the first alignment member or the second alignment member.