To provide a cellulose acylate film having high transmittance and retardation stability for a temperature change, to provide a dope composition affording the film and to provide an optical film and a liquid crystal display device using the same film.

The cellulose acylate dope composition comprises at least one kind of cellulose acylate and one or more kinds of photopolymerizable compounds photopolymerizable in the absence of a photopolymerization initiator. The cellulose acylate film is produced by a series of steps comprising a casting step of casting the composition and a light irradiating step. The optical film and liquid crystal display device are obtained by using the film.