| abstract |
An object of the present invention is to provide a retardation film having improved retardation, reverse wavelength dispersion, durability against temperature changes, and tear strength. A retardation film formed by mixing at least three types of cellulose acetates having different total substitution degrees, wherein the retardation film has a cellulose acetate (A) component having different total acyl group substitution degrees, A retardation film comprising a component (B) and a component (C) and satisfying the following formulas (1), (2) and (3). 2.00 ≦ DSac (A) + DSay (A) ≦ 2.50 Equation (1) In addition, the reference Re ≧ 100 nm is satisfied. 2.50 <DSac (B) + DSay (B) ≦ 2.90 (2) 2.20 ≦ DSac (C) + DSay (C) ≦ 2.70 Equation (3) [Selection figure] None |