Provided is an optical film containing a cellulose derivative, the optical film having an in-plane retardation Ro550 within the range of 120 to 160 nm measured at a wavelength of 550 nm under an atmosphere of a temperature of 23° C. and a relative humidity of 55%, and a ratio Ro450/Ro550 within the range of 0.65 to 0.99, Ro450/Ro550 being a ratio of an in-plane retardation Ro450 measured at a wavelength of 450 nm to the in-plane retardation Ro550 measured at a wavelength of 550 nm, wherein, a substituent of a glucose skeleton in the cellulose derivative satisfies the requirements (a) and (b) which are described in the specification, and the optical film contains a compound A satisfying the following condition defined by Expression (a1) which is described in the specification.