Post-processing device

A post-processing device comprising:

• a stacking section that aligns and stacks recording materials which are sequentially transported;
• a saddle stitching section that binds a plurality of sheets of recording materials, which are stacked on the stacking section, in central portions of the recording materials;
• a center folding section that folds the plurality of sheets of recording materials, which are bound in the central portions by the saddle stitching section, into two in the central portions;
• a pressing section that presses a booklet, which is formed of the plurality of sheets of recording materials center-folded by the center folding section, in a thickness direction of the booklet;
• and
• a discharge section that discharges the booklet, which is pressed by the pressing section, with a folded portion of the booklet being a leading portion,
• wherein the booklet is held and stopped in a state of being nipped by the discharge section, and transport is initiated after the lapse of a predetermined stop time so that the booklet is discharged.