NOVELTY - A flame-retardant resin composition comprises 70-99 parts mass polyphenylene ether-based resin (A) or a resin mixture of a polyphenylene ether-based resin and a styrene-based resin, 1-30 parts mass hydrogenated block copolymer (B), and 5-30 parts mass phosphorus-containing flame retardant (C). The component (A) comprises 70-100 %mass polyphenylene ether-based resin and 0-30 %mass styrene-based resin. The component (C) comprises a phosphate-based compound and compound chosen from phosphinate (I), diphosphinate (II) and their condensate.    USE - Resin composition is used for bonded structure used as junction box and connector of solar power generation modules (all claimed). Uses include but are not limited to electrical component, cable termination, motor vehicle component, hybrid vehicle and electric vehicles.    ADVANTAGE - The resin composition has excellent heat resistance, mechanical characteristics, electrical property, water resistance, chemical resistance, and flame retardance even when exposed to high-temperature environment for a long period of time. The fuming and adhesion of flame retardant to metal mold during injection molding are suppressed.    DETAILED DESCRIPTION - A flame-retardant resin composition comprises 70-99 parts mass polyphenylene ether-based resin (A) or a resin mixture of a polyphenylene ether-based resin and a styrene-based resin, 1-30 parts mass hydrogenated block copolymer (B), and 5-30 parts mass phosphorus-containing flame retardant (C) with respect to total of 100 parts mass components (A) and (B). The component (A) comprises 70-100 %mass polyphenylene ether-based resin and 0-30 %mass styrene-based resin. The component (C) comprises a phosphate-based compound and compound chosen from phosphinate of formula (I), diphosphinate of formula (II) and their condensate.    R1,R2=linear or branched 1-6C alkyl or 6-10C aryl;    R3=linear or branched 1-10C alkylene, 6-10C arylene, 6-10C alkyl arylene, or 6-10C aryl alkylene;    M=calcium ion, magnesium ion, aluminum ion, zinc ion, bismuth ion, manganese ion, sodium ion, potassium ion, or cationized nitrogen base;    m,n=1-3;    x=1 or 2;and    2n=mx.