Method for manufacturing polarizer, and polarizer and polarizing plate manufactured using same

A method for manufacturing a polarizer, the method comprising:

• a) immersing and swelling a polyvinyl alcohol-based film in an aqueous solution containing an azo-based dye having an absorption wavelength of 300 nm to 550 nm;
• b) dyeing the swollen polyvinyl alcohol-based film with an iodine-based dye;
• and
• c) stretching the dyed polyvinyl alcohol-based film,
• wherein the azo-based dye having an absorption wavelength of 300 nm to 550 nm includes any one or more members selected from the group consisting of chrysophenine and brilliant yellow, and
• wherein the aqueous solution containing the azo-based dye having an absorption wavelength of 300 nm to 550 nm contains the azo-based dye in an amount of 0.001 wt % to 0.5 wt %.