NOVELTY - A resin film is obtained by molding resin composition. The resin composition comprises polyethylene ether resin (a), hydrogenated block copolymers (b) and organophosphate-type flame retardant (c), and has melt viscosity/shear rate ratio of 0 to -0.4. The component (a) has molecular weight of 50000 or more in 5-20 %mass and 8000 or less in 12-30 %mass. The component (b) is obtained by hydrogenating copolymer block containing polymer block (A) having vinyl aromatic component as main component and polymer block (B) having conjugated diene compound.    USE - Resin film is used for electrical insulating and solar cell back sheet (all claimed). Uses include but are not limited to printed circuit board material, semiconductor package, film capacitor, motor, transformer, loudspeaker diaphragm and film sensor for motor vehicles, electronic/electrical components material, toner agitator and lithium ion battery.    ADVANTAGE - The resin film having excellent precision thickness, external appearance, heat resistant properties, chemical resistant properties, dielectric characteristics, electric insulation properties, flame retardance properties and hydrolysis resistance properties is manufactured at high yield.    DETAILED DESCRIPTION - A resin film is obtained by molding resin composition. The resin composition comprises 75-100 parts mass polyethylene ether resin (a), 25 parts mass hydrogenated block copolymers (b) and 1-30 parts mass organophosphate-type flame retardant (c) with respect to 100 parts mass of component (a) and component (b). The component (a) of 5-20 %mass has 50000 or more molecular weight and 12-30 %mass has 8000 or less molecular weight. The component (b) is obtained by hydrogenating copolymer block containing polymer block (A) having vinyl aromatic component as main component and polymer block (B) having conjugated diene compound. The melt viscosity/share rate ratio of the resin composition is 0 to -0.4. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of resin film, which involves melt-kneading component (a), component (b) and component (c) by an extruder; and    (2) raw film is obtained by extrusion tubular method.