A sheet processing apparatus includes a sheet holding unit, a sheet conveying unit configured to convey a plurality of sheets one by one onto the sheet holding unit during sheet processing, wherein the plurality of sheets including a first sheet and a second sheet that is conveyed immediately after the first sheet and is a last of the plurality of sheets that is conveyed, an adhesive applying unit configured to apply an adhesive material, and a control unit configured to control the adhesive material applying unit to apply the adhesive material on the first sheet held on the sheet holding unit before the second sheet is conveyed onto the first sheet and cause the adhesive material applying unit to not apply the adhesive material on the second sheet after the second sheet is conveyed onto the first sheet.