A high-thermal-conductivity polycarbonate resin composition, comprising: 100 parts by mass of an (A) resin component mainly composed of a polycarbonate resin; 5 parts by mass or more and 100 parts by mass or less of (B) 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 (C) 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 (B) graphitized carbon fiber relative to the amount of (C) glass beads ((B)/(C) (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 (SEM) 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 (SEM) 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 (A) resin component mainly composed of a polycarbonate resin; 5 parts by mass or more and 100 parts by mass or less of (B) 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 (C) 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 (B) graphitized carbon fiber relative to the amount of (C) glass beads ((B)/(C) (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 (SEM) 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 (SEM) 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. <EOS>