Polarizing film, method for molding polarizing film, and method for producing polarizing lens

A method for molding a polarizing film, the method comprising:

• molding the polarizing film into a curved shape, wherein
• when the polarizing film is molded, the polarizing film is heat-treated in a temperature range of Tg−20° C. or higher and Tg+10° C. or lower, where Tg is a glass transition point of a resin constituting the polarizing film,
• one chamber is divided into a first space and a second space,
• a molding die is disposed in the second space,
• the polarizing film is disposed in the chamber,
• the polarizing film is transfer-molded along a convex molding surface of the molding die by a differential pressure generated by making a pressure in the first space and a pressure in the second space different from each other, and
• the convex molding surface of the molding die is configured to be in contact with only a portion of the polarizing film that is configured to be formed into a polarizing lens, wherein
• a surface of the polarizing film facing the first space remains in a non-contact state during the transfer-molding.