Sheet processing apparatus and image forming system

摘要

A sheet processing apparatus including: a sheet supporting table that supports a sheet stack made of a plurality of sheets which have been folded; a stopper against which a first edge of the sheet stack which is a side to be cut of the sheet stack is pressed on the sheet supporting table; and a pushing member which pushes a second edge of the sheet stack so that the first edge is pressed against the stopper, wherein the pushing member comprises a first surface that is inclined with respect to a sheet supporting surface of the sheet supporting table so that the first surface restricts a height of the folded part of the sheet stack with respect to the sheet supporting surface when the pushing member presses the sheet stack towards the stopper.