A finishing apparatus in a copying machine is disclosed, which can finish large sized papers without enlarging the size of a tray base. The finishing apparatus includes a jogging assembly 170 aligning papers in left and right directions, a paper contact plate 166 provided with a stapler 196, a paper roller 200 pushing the papers to a paper stacker 134, ends of the papers being positioned in the stapler, a tray base 10 moving in a direction opposite to the paper roller to guide alignment of a set of the papers, and an angle adjusting unit guiding the papers by adjusting a tilt angle of the papers in accordance with the size of the papers.