A polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B) and 0.01 to 1.0 part by mass of alicyclic epoxy compound (C); or a polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B), 0.01 to 1.0 part by mass of alicyclic epoxy compound (C) and 0.01 to 1.0 part by mass of acrylic resin (D). The polycarbonate resin composition exhibits excellent optical properties, excelling in resistance to high temperature high humidity, resistance to heat aging (especially high temperature aging), heat resistance and impact resistance, and is suitable for production of optical parts, such as a lens of optical semiconductor device mounted on vehicles which can be used even in especially severe environment. There is further provided an optical part molded from the polycarbonate resin composition.