A sheet ejection apparatus includes an ejection unit, a thickness detection unit, a thickness storage unit, a sheet detection unit, an acquisition unit, a setting unit, and an adjustment unit. The ejection unit ejects a sheet. The thickness detection unit measures a thickness of the sheet. The thickness storage unit stores thickness information. The acquisition unit acquires a thickness of a preceding sheet. The setting unit sets a gap between the preceding sheet and the sheet in accordance with the thickness of the preceding sheet. The adjustment unit adjusts timing for supplying the sheet to a conveyance path in accordance with the gap.