A polycarbonate resin composition, comprising: a polycarbonate resin containing a polycarbonate-polyorganosiloxane copolymer (A-1) having a polycarbonate block comprising a repeating unit represented by the general formula and a polyorganosiloxane block comprising a repeating unit represented by the general formula; a copolymer having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate; a copolymer having constituent units derived from butadiene and methyl methacrylate; and a flame retardant, wherein a content of the polyorganosiloxane block moiety in the entire resin composition is from 0.70 mass% to 10 mass%, and a content of the constituent unit derived from butadiene in the entire resin composition is from 3 mass% to 10 mass%: wherein R 1 and R 2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO 2 -, -O-, or -CO-, R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, a and b each independently represent an integer of from 0 to 4, and n represents an average number of repetitions, wherein the component contains an acrylonitrile-butadiene-styrene terpolymer (B-1). a polycarbonate resin containing a polycarbonate-polyorganosiloxane copolymer (A-1) having a polycarbonate block comprising a repeating unit represented by the general formula and a polyorganosiloxane block comprising a repeating unit represented by the general formula; a copolymer having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate; a copolymer having constituent units derived from butadiene and methyl methacrylate; and a flame retardant, wherein a content of the polyorganosiloxane block moiety in the entire resin composition is from 0.70 mass% to 10 mass%, and a content of the constituent unit derived from butadiene in the entire resin composition is from 3 mass% to 10 mass%: wherein R 1 and R 2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, -S-, -SO-, -SO 2 -, -O-, or -CO-, R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, a and b each independently represent an integer of from 0 to 4, and n represents an average number of repetitions, wherein the component contains an acrylonitrile-butadiene-styrene terpolymer (B-1).