Patent ID: 7878496

Claim:
A sheet processing apparatus for binding a sheet bundle by a binding member having a curved shape, the sheet processing apparatus comprising: a support portion configured to support, as a sheet bundle, a plurality of sheets having punch holes formed therein, each distance from a side edge of each sheet of the sheet bundle to a central position of each punch hole being uniform; a sheet abutment member, which does not serve as the binding member, having a curved abutment surface that is curved to correspond to the curved shape of the binding member and that abuts against side edges of the plurality of sheets of the sheet bundle being supported by the support portion to adjust the position of each of the plurality of sheets of the sheet bundle so that the locus of centers of the punch holes continuing in the thickness direction of the sheet bundle is aligned with the curved shape of the binding member; and an attaching portion configured to attach the binding member to the punch holes of the sheet bundle in which the position of each of the plurality of sheets has been adjusted by the sheet abutment member.