Provided is a sheet processing apparatus for processing sheets, including: a sheet process tray on which sheets to be processed are stacked; a sheet transport means for transporting processed sheets on the sheet process tray; a pressure member which is provided on an upstream side of the sheet transport means with respect to a sheet transport direction and which moves in the sheet transport direction while pressing the processed sheets, for transporting the processed sheets in cooperation with the sheet transport unit; and a controller for selectively operating the pressure member.