A glass filler for a polycarbonate resin, whereby the refractive index of the glass filler can be improved to the same level as a polycarbonate resin, and the transparency of a molded product after reinforced with such a filler can be maintained without coloration, and a polycarbonate resin composition employing such a filler, are provided. The polycarbonate resin composition comprises a polycarbonate resin and a glass filler which comprises, as inorganic components in the entire glass filler, from 50 to 60 mass % of silicon dioxide (SiO.sub.2), from 7 to 15 mass % of aluminum oxide (Al.sub.2O.sub.3), from 10 to 20 mass % of calcium oxide (CaO), from 0 to 5 mass % of magnesium oxide (MgO), from 2 to 8 masse of zirconium is oxide (ZrO.sub.2), from 0 to 10 mass % of zinc oxide (ZnO), from 0 to 10 mass % of strontium oxide (SrO), from 0 to 18 mass % of barium oxide (BaO), from 0 to 2 mass % of lithium oxide (Li.sub.2O), from 0 to 2 mass % of sodium oxide (Na.sub.2O), and from 0 to 2 mass % of potassium oxide (K.sub.2O), provided that the total content of the lithium oxide (Li.sub.2O), the sodium oxide (Na.sub.2O) and the potassium oxide (K.sub.2O) is from 0 to 2 mass % based on the entire glass filler.