The purpose of the present invention is to provide a cellulose acetate film having excellent adhesion to a polarizer, and in which there is minimal change in retardation with respect to residual solvent during film stretching. This phase difference film contains cellulose acetate α having a degree of acetyl substitution of 2.1 or less, cellulose acetate β having a degree of acetyl substitution of 2.3-2.5, and a compound having a van der Waals volume of 500 Å3 to 1000 Å3 in the amount of 5-10 mass % with respect to the total amount of the cellulose acetate α and the cellulose acetate β, and the phase difference film is stretched.