The present application pertains to a production method for a polymer, including a step for polymerizing a starting material composition (I) that includes: a monomer mixture (I-I) containing a macromonomer (a) represented by the following formula (1), and (b) a vinyl monomer; and a non-metallic chain transfer agent at a level of 0.01-5 mass parts per 100 mass parts of the monomer mixture (I-I); a polymer obtained by the production method; and a molded article. According to the present invention, there can be provided a polymer having exceptional resistance to dwell-induced degradation, and a molded article having exceptional yellowing resistance, a low haze value, and exceptional pliability.