| 摘要 |
A sheet processing apparatus includes a holding portion that nips and holds a booklet, which includes folded sheets, by a pair of holding members opposite to each other, and a pressing portion that enters a gap between the pair of holding members to press a spine of the booklet held by the holding portion while moving along the spine of the booklet so as to deform the spine of the booklet, wherein the pressing portion changes its moving direction along the spine of the booklet and changes the pressing position thereof in the thickness direction of the booklet held between the pair of holding members, when the pressing portion deforms the spine of the booklet. |
