<p>Provided is a method for manufacturing a thin polarizing film having good optical characteristics. The method of the present invention comprises the steps of: preparing a stack (10) by forming a polyvinyl alcohol-based resin layer (12) on a thermoplastic resin base (11) having a coefficient of water absorption of between 0.2% and 3.0% and a glass transition temperature (Tg) of 60ºC or greater, and drawing the stack (10) while immersed in a boric acid solution.</p>
