Polyvinyl alcohol film and polarizing film

Abstract

The following is provided as a polyvinyl alcohol film in which the elution amount of a polyvinyl alcohol resin into water is small during polarizing film manufacturing, contamination of a chemical tank during polarizing film manufacturing is suppressed, a polarizing film with few foreign matter defects can be obtained with good productivity, and the film is excellent in drawing processability during polarizing film manufacturing.　A polyvinyl alcohol film satisfying formula (1) in a section from a surface layer of each film surface to a depth of 1 μm on both surfaces of the polyvinyl alcohol film, and having a weight swelling rate of 185%-210%.　(1): | K | ≥ 3.5 × 10-5 (where | K | is an absolute value of the ratio (inclination) of the change in the magnitude of birefringence from the surface layer to a depth of 1 μm).