A sheet ejection apparatus which is built in as a part of a processing apparatus main unit for ejecting a sheet processed by a processing section in the processing apparatus main unit to a sheet stack section placed on the top of the processing apparatus main unit. The processing apparatus main unit is formed with a unit reception section and one of sheet ejection units different in specifications can be attached to the unit reception section. The invention is also applied to a sheet processing apparatus using the sheet ejection apparatus.

 
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