To provide an optical laminated film which has no luminance fall at a film end part and no luminance variation in a film surface due to generation of curls or wrinkles and which is suitable for a luminance enhancing film and to provide a polarized light source apparatus in which the optical laminated film is incorporated and which has a good display characteristic and a liquid crystal display apparatus in which the polarized light source apparatus is incorporated.

The optical laminated film comprises a polarized light separation sheet which contains a 1st base material and a resin layer with cholesteric regularity, an adhering layer and a 2nd base material. In the optical laminated film, a coefficient of linear expansion of the 1st base material and a coefficient of linear expansion of the 2nd base material are almost the same. The polarized light source apparatus is characterized by incorporating the optical laminated film therein.