A flame retardant resin composition comprising: 70 to 99 parts by mass of a polyphenylene ether resin, or a mixed resin of a polyphenylene ether resin and a styrene-based resin; 1 to 30 parts by mass of a hydrogenated block copolymer; and 5 to 30 parts by mass of a phosphorus-containing flame retardant based on the total 100 parts by mass of the and the; wherein the component comprises 70 to 100 % by mass of a polyphenylene ether resin (A-1) and 0 to 30 % by mass of a styrene-based resin (A-2); and the component comprises a phosphate ester compound (C-1) and at least one selected from the group consisting of a phosphinate salt represented by the following general formula, a diphosphinate salt represented by the following general formula, and a condensate thereof (C-2): wherein R 1 and R 2 are a linear or branched C1-C6 alkyl group or a C6-C10 aryl group may be the same or different; R 3 is any one selected from the group consisting of a linear or branched C1-C10 alkylene group, a C6-C10 arylene group, a C6-C10 alkylarylene group, and a C6-C10 arylalkylene group; M is one or more selected from the group consisting of a calcium ion, a magnesium ion, an aluminum ion, a zinc ion, a bismuth ion, a manganese ion, a sodium ion, a potassium ion, and a cationized nitrogen base; m is 1, 2 or 3; n is 1 to 3; x is 1 or 2; and 2n=mx, characterized in that the comprises: 50 to 70 % by mass of the phosphate ester compound (C-1); and 30 to 50 % by mass of at least one selected from the group consisting of a phosphinate salt represented by the general formula, a diphosphinate salt represented by the general formula, and a condensate thereof (C-2). 70 to 99 parts by mass of a polyphenylene ether resin, or a mixed resin of a polyphenylene ether resin and a styrene-based resin; 1 to 30 parts by mass of a hydrogenated block copolymer; and 5 to 30 parts by mass of a phosphorus-containing flame retardant based on the total 100 parts by mass of the and the; wherein the component comprises 70 to 100 % by mass of a polyphenylene ether resin (A-1) and 0 to 30 % by mass of a styrene-based resin (A-2); and the component comprises a phosphate ester compound (C-1) and at least one selected from the group consisting of a phosphinate salt represented by the following general formula, a diphosphinate salt represented by the following general formula, and a condensate thereof (C-2): wherein R 1 and R 2 are a linear or branched C1-C6 alkyl group or a C6-C10 aryl group may be the same or different; R 3 is any one selected from the group consisting of a linear or branched C1-C10 alkylene group, a C6-C10 arylene group, a C6-C10 alkylarylene group, and a C6-C10 arylalkylene group; M is one or more selected from the group consisting of a calcium ion, a magnesium ion, an aluminum ion, a zinc ion, a bismuth ion, a manganese ion, a sodium ion, a potassium ion, and a cationized nitrogen base; m is 1, 2 or 3; n is 1 to 3; x is 1 or 2; and 2n=mx, characterized in that the comprises: 50 to 70 % by mass of the phosphate ester compound (C-1); and 30 to 50 % by mass of at least one selected from the group consisting of a phosphinate salt represented by the general formula, a diphosphinate salt represented by the general formula, and a condensate thereof (C-2). wherein R 1 and R 2 are a linear or branched C1-C6 alkyl group or a C6-C10 aryl group may be the same or different; R 3 is any one selected from the group consisting of a linear or branched C1-C10 alkylene group, a C6-C10 arylene group, a C6-C10 alkylarylene group, and a C6-C10 arylalkylene group; M is one or more selected from the group consisting of a calcium ion, a magnesium ion, an aluminum ion, a zinc ion, a bismuth ion, a manganese ion, a sodium ion, a potassium ion, and a cationized nitrogen base; m is 1, 2 or 3; n is 1 to 3; x is 1 or 2; and 2n=mx, characterized in that the comprises: 50 to 70 % by mass of the phosphate ester compound (C-1); and 30 to 50 % by mass of at least one selected from the group consisting of a phosphinate salt represented by the general formula, a diphosphinate salt represented by the general formula, and a condensate thereof (C-2). 50 to 70 % by mass of the phosphate ester compound (C-1); and 30 to 50 % by mass of at least one selected from the group consisting of a phosphinate salt represented by the general formula, a diphosphinate salt represented by the general formula, and a condensate thereof (C-2).