Flexible polarizing film, manufacturing method for same and image display device

The present invention relates to a flexible polarizing film comprising a polyvinyl alcohol polarizer, not thicker than 10μm, in which polyvinyl alcohol resin is orientated in one direction and iodine or a dichromatic pigment is adsorbed and orientated on the polyvinyl alcohol resin, wherein the flexible polarizing film exhibits no breaking, traces of cracking or light-loss in either direction after being subjected to a U-shape flexing test in which the film is repeatedly flexed into a U-shape in the orientation direction in which the polyvinyl alcohol resin is orientated and the direction orthogonal to the orientation direction. The flexible polarizing film according to the present invention has a high level of flexibility despite using a polyvinyl alcohol polarizer.