NOVELTY - A resin composition contains polypropylene resin (a) (25-99 %mass), polyphenylene-ether resin (b) (75-1 %mass) and hydrogenated block copolymer (c) (1-20 parts mass). The hydrogenated block copolymer (c) is formed by hydrogenating block copolymer consisting of polymeric block (A) containing styrene (c-1) (15-50 %mass), and polymeric block (B) containing butadiene having vinyl bond content of 70-90%. The number average molecular weight (Mnc) of polymeric block (A) is 100000 or less. The number average molecular weight (MncA) of polymeric block (A) is 8000 or more.    USE - Resin composition is used for secondary battery case, separator for lithium ion battery, sheet film, stretched sheet film, motor-vehicle mechanism element e.g. air-conditioner housing, heater housing, ducts, fuel-tank protector, connector housing, fuel filter housing, fuel filter cap, cooling fan, fan shroud, timing belt cover, oil tank, oil-tank cap, radiator tank and undercover, motor-vehicle external trim e.g. bumper, bumper beam, low bumper stiffener, side spoiler, front grille, rear garnish, door outer handle, pillar cover, door mirror component, mat guard, splash board, cowl panel, wheel cap, clip, fastener and lamp housing, automotive interior trim e.g. instrument panel, door trim panel, console box, pillar trim, differential grill, visor case of meter component, cover, rear-view mirror component, sheet bag, headrest guide, seat-hinge cover, seatbelt, storage room cover box, steering wheel, horn cover, shift lever, shift lever knob and pedal, electric wire, solid methanol battery fuel case, fuel cell distributing pipe or its coupling, tank for water cooling, boiler exterior case, component or chassis of ink periphery of inkjet printer, and water distribution pipe or its coupling (all claimed).    ADVANTAGE - The resin composition provides molded product having excellent heat resistance, workability and mechanical characteristics.    DETAILED DESCRIPTION - A resin composition contains polypropylene resin (a) (25-99 %mass), polyphenylene-ether resin (b) (75-1 %mass) and hydrogenated block copolymer (c) (1-20 parts mass). The polyphenylene-ether resin (b) has weight average molecular weight of 15000-25000, measured in conversion of polystyrene using chloroform solvent by gel permeation chromatography, and molecular weight distribution of 1.5-3. The hydrogenated block copolymer (c) is formed by hydrogenating block copolymer consisting of polymeric block (A) containing styrene (c-1) (15-50 %mass), and polymeric block (B) containing butadiene having vinyl bond content of 70-90%. The number average molecular weight (Mnc) of polymeric block (A) is 100000 or less. The number average molecular weight (MncA) of polymeric block (A) is 8000 or more, measured in conversion of polystyrene using chloroform solvent by gel permeation chromatography. INDEPENDENT CLAIMS are included for the following:    (1) secondary-battery case, which is obtained by molding the resin composition;    (2) separator for lithium ion battery, which is obtained by carrying out film molding of the resin composition; and    (3) electric wire, which is obtained by coating the resin composition to a metallic conductor or an optical fiber, and a cable.