Provided are: a polycarbonate resin which contains (A) a unit (A) represented by formula (A) (wherein each of R1 and R2 independently represents a hydrogen atom, a hydrocarbon group which may contain an aromatic group having 1-10 carbon atoms, or a halogen atom, and each of m and n independently represents an integer of 0-4), (B) a unit (B) represented by formula (B) (wherein each of R3 and R4 independently represents a hydrogen atom, a hydrocarbon group which may contain an aromatic group having 1-10 carbon atoms, or a halogen atom, each of R5 and R6 independently represents a hydrocarbon group which may contain an aromatic group having 1-10 carbon atoms, each of s and t independently represents an integer of 0-4, and each of p and q independently represents an integer of 1 or more), and (C) a carbonate unit (C) derived from an aliphatic diol compound and/or an alicyclic diol compound, and which satisfies formulae (I) and (II); and an optical film which is formed from this polycarbonate resin. This polycarbonate resin has wavelength dispersion characteristics close to the ideal broadband, excellent durable stability, excellent flexibility, high retardation developability, low photoelastic constant and excellent melt processability. (I) The molar ratio of unit (A) to unit (B), namely (A)/(B) is 0.2-11.0. (II) The molar ratio of (unit (A) + unit (B)) to (unit (A) + unit (B) + unit (C)), namely (A + B)/(A + B + C) is 0.30-0.60.