An optical compensation film comprising a cellulose ester film is
disclosed. In the film, (a) each of photoelastic coefficient C(md) in a
mechanical direction and photoelastic coefficient C(td) in the transverse
direction of the cellulose ester film is 1.times.10.sup.-9 to
1.times.10.sup.-13 Pa.sup.-1 and C(md).vertline.S(td).vertline..
