A high-thermal-conductivity polycarbonate resin composition, comprising: 100 parts by mass of an resin component mainly composed of a polycarbonate resin; 5 parts by mass or more and 100 parts by mass or less of graphitized carbon fiber having a longitudinal thermal conductivity of 100 W/m K or more and an average fiber diameter in the range of 5 to 20 μm; and 5 parts by mass or more and 200 parts by mass or less of glass beads having an average particle size in the range of 1 to 100 μm and a sphericity in the range of 1 to 2, wherein the graphitized carbon fiber is a short carbon fiber aggregate manufactured by aggregating short carbon fibers having a length of 2 to 20 mm at a bulk density in the range of 450 to 800 g/l with a sizing agent, cutting the aggregate to a predetermined length, and then graphitizing the aggregate by heating the aggregate in an inert gas atmosphere at a temperature in the range of 2800°C to 3300°C, while the sizing agent content is 0.1% by mass or less, wherein the amount of graphitized carbon fiber relative to the amount of glass beads ( / (mass ratio)) is 0.1 or more and less than 1, and wherein the sphericity of the glass beads is determined by calculating the ratio of the average maximum particle size/the average minimum particle size, wherein the average maximum particle size is a mean value obtained by measuring the maximum particle sizes of 100 samples in scanning electron microscope observation, and the average minimum particle size is a mean value obtained by measuring the minimum particle sizes of 100 samples in scanning electron microscope observation, the maximum particle size being a diameter at a portion having the largest distance between two parallel plates when the glass beads are placed between two parallel plates, and the minimum particle size being a diameter at a portion having the smallest interval between two parallel plates when the glass beads are placed between two parallel plates. 100 parts by mass of an resin component mainly composed of a polycarbonate resin; 5 parts by mass or more and 100 parts by mass or less of graphitized carbon fiber having a longitudinal thermal conductivity of 100 W/m K or more and an average fiber diameter in the range of 5 to 20 μm; and 5 parts by mass or more and 200 parts by mass or less of glass beads having an average particle size in the range of 1 to 100 μm and a sphericity in the range of 1 to 2, wherein the graphitized carbon fiber is a short carbon fiber aggregate manufactured by aggregating short carbon fibers having a length of 2 to 20 mm at a bulk density in the range of 450 to 800 g/l with a sizing agent, cutting the aggregate to a predetermined length, and then graphitizing the aggregate by heating the aggregate in an inert gas atmosphere at a temperature in the range of 2800°C to 3300°C, while the sizing agent content is 0.1% by mass or less, wherein the amount of graphitized carbon fiber relative to the amount of glass beads ( / (mass ratio)) is 0.1 or more and less than 1, and wherein the sphericity of the glass beads is determined by calculating the ratio of the average maximum particle size/the average minimum particle size, wherein the average maximum particle size is a mean value obtained by measuring the maximum particle sizes of 100 samples in scanning electron microscope observation, and the average minimum particle size is a mean value obtained by measuring the minimum particle sizes of 100 samples in scanning electron microscope observation, the maximum particle size being a diameter at a portion having the largest distance between two parallel plates when the glass beads are placed between two parallel plates, and the minimum particle size being a diameter at a portion having the smallest interval between two parallel plates when the glass beads are placed between two parallel plates.