An integrated high-brightness polarizing film according to the present invention increases brightness by preventing a first optical film from being spaced apart from a reflective polarizing film. The reflective polarizer according to the present invention eliminates a separate adhesive layer and/or a separate protective layer (PBL) inside a core layer and between the core layer and a skin layer by integrating a plurality of groups having various average optical thicknesses. Therefore, the present invention significantly reduces manufacturing costs; and has an advantage in maximizing the optical properties of a polarizing film having a limited thickness. Also, the present invention completely reflects S-waves in the wavelength region of visible light using a plurality of groups having various average optical thicknesses. Therefore, the present invention significantly reduces manufacturing costs; and has an advantage in maximizing the optical properties of a polarizing film having a limited thickness.
