A sheet post-processing apparatus includes a sheet folding unit and a binding processing unit. The sheet folding unit is located along a conveyance path of a sheet to be folded and performs folding processing on the sheet to form a folded body having a fold along a direction crossing a sheet conveyance direction. The binding processing unit is located downstream of the sheet folding unit in the sheet conveyance direction and performs binding processing on the folded body to bind a lateral side of the folded body.