Patent ID: 8197916

Claim:
A cellulose ester film, containing: fine particles having an average particle size of 1 nm or more and 400 nm or less in an amount of 1% by weight or more and 50% by weight or less in the cellulose ester film; and a compound having a negative birefringence to a stretching direction; wherein a retardation value Ro defined by the following Equation (I) is within a range of 0 nm or more and 5 nm or less, and a retardation value Rt defined by the following Equation (II) is within a range of −10 nm or more and 20 nm or less, provided that the retardation value Ro and the retardation value Rt are measured under the condition of 23° C. and 55%RH, Ro =(nx−ny)× d Equation (I) Rt =(( nx+ny ) /2 −nz )× d Equation (II) in Equations (I) and (II), nx represents a refractive index in a film in-plane slow axis direction, ny represents a refractive index in a film in-plane fast axis direction, nz represents a refractive index in a film thickness direction, and d represents a film thickness (nm).