Provided is a resin composition comprising: a polycarbonate resin (A) containing, as main repeating units, a unit (a-1) represented by the following formula (a-1) and a unit (a-2) represented by the following formula (a-2) (wherein, W represents a C1-20 alkylene group or a C6-20 cycloalkylene group, R represents a branched or linear-chain C1-20 alkyl group or a C6-20 cycloalkyl group optionally substituted, and m represents an integer of 0 to 10) and an acrylic resin (B), and the polycarbonate resin and the acrylic resin are in a weight ratio of 40:60 to 99:1, wherein the resin composition has a single glass transition temperature, which is in the range of 90° C. to 150° C., and the resin composition has excellent transparency, chemical resistance, surface hardness and heat resistance, and has a low photoelastic coefficient.