A process for producing a cellulose acylate film, the process comprising
melt-cast filming a composition comprising a cellulose acylate that has a
specific acyl substitution degree, and that has a residual sulfate in an
amount equal to or less than a definite amount (in terms of an amount of
a sulfur atom), and a a cellulose acylate film produced by the process, a
high-quality retardation film, a polarizing plate, an optical
compensatory film, an anti-reflective film and an image display device
using same.