| 摘要 |
A sheet processing apparatus that performs bookbinding processing on a folded sheet bundle, includes a holding portion configured to hold a folded sheet bundle, and a pressing member configured to press a folded spinal portion of the sheet bundle held by the holding portion. At least one of the holding portion and the pressing member can move in a direction to approach each other along a surface of the sheet held by the holding portion to press the folded spinal portion of the sheet bundle.
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