| abstract |
An object of the present invention is to provide an optical film that can substantially give a phase difference of λ / 4, further suppresses fluctuations in optical performance due to humidity fluctuations, and also has a function as a polarizing plate protective film, and the optical It is to provide a circularly polarizing plate provided with a film and an organic electroluminescence display device provided with the circularly polarizing plate as an antireflection member. The optical film of the present invention, the temperature 23 ° C., under a relative humidity of 55% for retardation value Ro 550 of was measured at a light wavelength 550nm film plane, a phase difference film plane measured respectively by light wavelengths 450nm and 550nm A compound containing a cellulose derivative having a ratio of values of Ro 450 and Ro 550 within a specific range, wherein a substituent of the glucose skeleton of the cellulose derivative satisfies a specific requirement and has a specific orientation A is contained. |