The invention aims to provide a method for manufacturing a polarizing plate, which can suppress air bubbles when an active energy-ray-curable adhesive is used for bonding a polarizer and a transparent protective film. Additionally, the invention aims to provide an optical film which comprises the polarizing plate that is prepared through the method. The method for manufacturing the polarizing plate is characterized by comprising the steps of: a step of at least performing dyeing treatment, crosslinking treatment and stretching treatment on a polyvinyl alcohol series film, and then performing drying treatment for manufacturing the polarizer; and a step of laminating the transparent protective film on at least one surface of the polarizer in a manner that an active energy-ray-curable adhesive layer is sandwiched between the transparent protective film and the surface of the polarizer; wherein in the drying treatment, the polyvinyl alcohol series film on which dyeing treatment, crosslinking treatment and stretching treatment are performed is conveyed in a preset direction and is simultaneously heated through a plurality of rollers, wherein a ratio (L1/W1) between a distance L1 between the rollers and the width W1 of the polyvinyl alcohol series film on which drying treatment is to be performed is less than 0.4.