There is provided a sheet manufacturing apparatus, including: a supplying unit configured to supply a cut-form material including fibers; a detection unit configured to detect information related to a weight of the material which is processed to be supplied by the supplying unit; a defibrating unit configured to defibrate the material; and a forming unit configured to form a sheet by using at least a part of a defibrated material defibrated by the defibrating unit, in which a supply interval of at least one material among a plurality of materials to be supplied later increases in a case where the weight of the material which is supplied at a unit time is heavy rather than in a case where the weight is light.