To provide an optical film in which variation in retardation is suppressed and failure due to film deformation is remedied, and to provide a method for producing the same.

There is provided a fiber composite material containing cellulose nanofibers having a structure represented by general formula (A) and a resin, wherein Ra-Rf each independently represents H, optionally substituted 1-30C alkyl or optionally substituted 2-30C alkenyl; M represents H or a monovalent metal atom; n represents 0 or 1; and Cel represents a cellulose nanofiber residue.