PURPOSE: To obtain a flame-retardant styrenic resin composition useful for household electric appliances, having excellent light resistance, heat resistance and impact resistance, comprising a styrenic resin, a specific flame-retardant, etc., and antinomy trioxide in a specific ratio. constitution

CONSTITUTION: This flame-retardant styrenic resin composition is obtained by blending (A) 100 pts.wt. of a styrenic resin with (B) 1-24 pts.wt. of a compound of the formula [R1 is H or CH3; A is C(CH3)2 or SO2], (C) 1-12 pts.wt. of a bromine-containing epoxy polymer having 1,000-10,000 molecular weight, (D) 1-15 pts.wt. of tris(tribromoneopentyl)phosphate and (E) 0-10 pts.wt. of antinomy trioxide and the total amounts of the components B and C are 5-26 pts.wt.