Abstract: An object of the present invention is to provide a resin composition that exhibits only a small change in birefringence due to external force and can be suitably used for production of optical members and to provide an optical film obtained by using the resin composition and a liquid crystal display device using the optical film. The provided resin composition for an optical material contains: a polymer (A) obtained by using (meth)acrylic acid or an alkyl(meth)acrylate; and a polyester resin (B). The polyester resin (B) is a polyester resin (B1) that has, in a main chain thereof, an aromatic ring-containing structural unit and has a number average molecular weight of 300 to 5,000, and each end of the main chain is capped with a monocarboxylic acid residue or a monoalcohol residue.

Abstract: An object of the present invention is to provide a resin composition that exhibits only a small change in birefringence due to external force and can be suitably used for production of optical members and to provide an optical film obtained by using the resin composition and a liquid crystal display device using the optical film. The provided resin composition for an optical material contains: a polymer (A) obtained by using (meth)acrylic acid or an alkyl(meth)acrylate; and a polyester resin (B). The polyester resin (B) is a polyester resin (B1) that has, in a main chain thereof, an aromatic ring-containing structural unit and has a number average molecular weight of 300 to 5,000, and each end of the main chain is capped with a monocarboxylic acid residue or a monoalcohol residue.