A sheet manufacturing apparatus includes comprises a screening unit configured to screen a defibrated material obtained by defibration treatment, and a sheet forming unit configured to form a sheet with the defibrated material screened with the screening unit. The screening unit has a first screening unit to which a plurality of first openings are provided and a second screening unit to which a plurality of second openings larger than the first openings are provided, and the defibrated material is screened by the first screening unit and the second screening unit. The defibrated material is screened at one of either the first screening unit or the second screening unit and thereafter screened at the other, and the sheet forming unit forms the sheet with the defibrated material that does not pass through the first openings and does pass through the second openings.