Disclosed is a sheet post-processing device, including: a downstream side
intermediate stacking unit having a pair of slide guides for supporting left and
right edges of the sheet that is sent, the slide guides moving toward and away
from each other so that the sheet is pressed against one of the slide guides that
serves as a reference by the other slide guide to be positioned; a processing unit
for processing the sheet positioned by the downstream side intermediate stacking
unit; and a stacking unit for receiving the sheet that is dropped through a gap
created between the slide guides, in which the pair of slide guides each have a
bottom piece for supporting the edge of the sheet, and in which the bottom piece
of the other slide guide is partially cut off to provide a remaining portion, the
remaining portion making the gap between the bottom pieces wider on the upstream
side than on the downstream side in the sheet conveying direction.
