To provide a method for producing an optical film which can simply suppress bowing even when complicated temperature control is not carried out during orientation and has a reduced axial dislocation.

A thermoplastic resin film is 0.01-0.1 m high in which a plurality of stripe-shaped projections stretching in the same direction are arranged at intervals of 1.0-2.5 mm, and is stretched in the elongation direction of the stripe-shaped projections.