Patent ID: 8089593

Claim:
A stretched optical resin film comprising: a polymer resin; 0.1 to 20 parts by mass of at least one additive having a negative intrinsic birefringence with respect to 100 parts by mass of the polymer resin; and 0.1 to 20 parts by mass of at least one additive having a positive intrinsic birefringence with respect to 100 parts by mass of the polymer resin, wherein the film has retardations satisfying relations (A) to (F): (A) 0 nm<Re(546)<300 nm (B) 30 nm<Rth(546)<700 nm (C) 0.1<Re(480)/Re(546)<1.0 (D) 1.0<Re(628)/Re(546)<4.0 (E) 0.8<Rth(480)/Rth(546)<4.0 (F) 0.1<Rth(628)/Rth(546)<1.2 wherein Re(λ) represents an in-plane retardation at a wavelength of λ, and Rth(λ) represents a retardation in a thickness direction of the stretched optical resin film at a wavelength of λ.