Polarizing film, optical film and liquid crystal display using polarizing film

A polarizing film comprising a polarizer (A) and a protection film (B) prepared on at least one face of the polarizer (A), wherein the protection film (B) is adhered to the polarizer (A) without using adhesives, wherein the protection film (B) is formed by at least two layers of the same materials but having different softening points, the layer having the lower softening point being located on a side of the protection film (B) facing the polarizer (A), and wherein the polarizer (A) is a dyed and stretched hydrophilic polymer film.