TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: In potential induced degradation test, the sealing material in sheet form having thickness of 1200 mu m is created using the resin composition, and is set in order of a light-receiving surface protection component, sealing material, solar cell element, sealing material, and back surface protection component, and solar cell module is produced using vacuum laminator, and water is filled in the surface of the surface-protection component of produced module, and maintained for 96 hours within the constant temperature and humidity chamber at 60 degrees C of tank internal temperature and 85% relative humidity applying direct current of 1000V to an internal circuit is based on IEC61215, and IV characteristic is evaluated. The maximum output electric power Pmax of IV characteristic after test is less than 3% with respect to initial value, and the light-receiving surface protection component, single crystal silicon-type solar cell element, and polyethylene terephthalate-type back sheet used are 3.2 mm-thickness white-board float glass as back surface protection component. The component (A) has total number of double bond more than 0.50 (units/total 1000 carbon atoms), in which the number of double bonds is number per carbon number of the total 1000 units of principal chain and side chain measured by nuclear magnetic resonance. Preferred Composition: The component (A) has vinyl and vinylidene total content of 50% or more of the total number of whole double bond of vinyl, vinylidene, di-substituted-vinylene and tri-substituted vinylene. The component (B) contains ethylene functional group-containing monomer copolymer chosen from ethylene-vinyl acetate copolymer, ethylene-(meth)acrylate copolymer, ethylene-(meth)acrylic-acid copolymer, ethylene-(meth)acrylic acid ester multicomponent copolymer, and ethylene-(meth)acrylic-acid multi-component copolymer. The component (B) is ethylene-vinyl acetate copolymer containing 20-40 wt.% vinyl acetate. The resin composition further comprises 0.2-5 pts. wt. organic peroxide (D) with respect to 100 pts. wt. resin components (A) and (B), and silane coupling agent (E). The ethylene-( alpha )-olefin copolymer contains 5-30 mol% propylene as comonomer.