Disclosed is an optical film in which a minute interference unevenness is reduced. The optical film comprises a transparent film having a thickness of 10 μm to 150 μm, and a first layer and a second layer, in this order, on the transparent film, wherein values of in-plain mean refractive indices thereof satisfy the formula: the second layer>the first layer>the transparent film; the difference in in-plane mean refractive indices between the first layer and the second layer and the difference in in-plane mean refractive indices between the first layer and the transparent film are each 0.02 or more; and the optical thickness D of the first layer satisfies the formula: 270×N−150−75 nm≦D≦270×N−150+75 nm (1≦N≦8 where N is a natural number).