A method for producing a polycarbonate copolymer and

The object of the present invention is directed to provide a polycarbonate copolymer, the polycarbonate copolymer has excellent mechanical strength and heat resistance, a small refractive index, large Abbe number, small birefringence and excellent transparency, and which comprises plant-derived raw materials. The polycarbonate copolymer of the present invention contains a structural unit derived from the following formula and dihydroxy compound structural unit derived from an alicyclic dihydroxy compound (1) represented by, wherein the Abbe number of the polycarbonate copolymer is 50 or more and 5% weight loss temperature is 340 ℃. The present invention further relates to a method for producing the polycarbonate copolymer, wherein, in the presence of a polymerization catalyst, by the following formula (1) the dihydroxy compound and an alicyclic dihydroxy compound and the carbonic acid ester represented by the this producing the polycarbonate copolymer.