A sheet manufacturing apparatus includes a screening unit having first openings for screening a defibrated material that is defibrating-processed; a refining unit that has second openings having sizes equal to or greater than sizes of the first openings and refines the defibrated material passing through the screening unit by causing the defibrated material to pass through the second openings; and a deposition unit on which the defibrated material passing through the refining unit is deposited.

A sheet manufacturing apparatus includes a first sieve that has a first opening for screening a defibrated material that is defibrating-processed, a second sieve that has a second opening having a size equal to or greater than a size of the first opening and refines the defibrated material passing through the first sieve by causing the defibrated material to pass through the second opening, and a belt on which the defibrated material passing through the second sieve is deposited.

A sheet manufacturing apparatus includes a first sieve that has a first opening for screening a defibrated material that is defibrating-processed, a second sieve that has a second opening having a size equal to or greater than a size of the first opening and refines the defibrated material passing through the first sieve by causing the defibrated material to pass through the second opening, and a belt on which the defibrated material passing through the second sieve is deposited.