OPTICAL FILM, POLARIZER, AND IMAGE DISPLAY DEVICE

To provide an optical film capable of improving the adhesion between a first functional layer and a second functional layer while reducing the thickness, a polarizer including the optical film, and an image display device.SOLUTION: An optical film 10 includes a light transparent base material 11, a first functional layer 12, and a second functional layer 13 in this order. At least either one of the first functional layer 12 and the second functional layer 13 contains a UV absorber agent. The optical film 10 further includes a mixed layer 14 that contains a component of the first functional layer 12 and a component of the second functional layer 13, which is placed between the first functional layer 12 and the second functional layer 13, and which abuts on the first functional layer 12 and the second functional layer 13. The total film thickness of the first functional layer 12, the second functional layer 13, and the mixed layer 14 is 1 μm or more and 10 μm or less, and the ratio of the thickness of the mixed layer 14 to the total thickness of first functional layer 12, second functional layer 13 and mixed layer 14 is 0.6% or more and 40% or less.SELECTED DRAWING: Figure 1 【課題】薄型化を図ることができ、かつ第１機能層と第２機能層の密着性を向上させることができる光学フィルム、このような光学フィルムを備える偏光板および画像表示装置を提供する。【解決手段】光透過性基材１１、第１機能層１２、および第２機能層１３をこの順に備える光学フィルム１０であって、第１機能層１２および第２機能層１３の少なくともいずれかが、紫外線吸収剤を含み、第１機能層１２と第２機能層１３の間に設けられ、第１機能層１２および第２機能層１３に隣接し、かつ第１機能層１２の成分および第２機能層１３の成分を含む混合層１４をさらに備え、第１機能層１２、第２機能層１３および混合層１４の合計膜厚が、１μｍ以上１０μｍ以下であり、第１機能層１２、第２機能層１３および混合層１４の合計膜厚に対する混合層１４の膜厚の割合が、０．６％以上４０％以下である、光学フィルム１０。【選択図】図１