TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: At least one of the joining layer and fluorine resin layer contains silicon dioxide particles. The silicon dioxide particle exist in an at least one interface among the interface of the joining layer and the fluorine resin layer, and the interface of the joining layer and the solar cell. The silicon dioxide particle is a hydrophilic amorphous silica particle. The glass fiber sheet is a nonwoven fabric made from glass fiber. The nonwoven fabric made from glass fiber has thickness of 0.15-0.85 mm, basic weight of 15-110 g/m2, and bulk density of 0.1-0.5 g/cm3. The heat-resistant woven fabric contains at least one of glass fiber, aramid fiber, and iron-type alloy fiber. The woven structure of the heat-resistant woven fabric is a basket weave, a twill weave, a modified twill weave, a satin weave, or plain weave. The solar cell is a photovoltaic cell portion (8). The first sealing material layer (9a) and second sealing material layer (9b) are formed on both surfaces of the photovoltaic cell portion. The ethylene-tetrafluoroethylene copolymer layer (10) is formed on the first sealing material layer or the second sealing material layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The first sealing material layer and second sealing material layer contains at least one of polyethylene resin, ethylene-vinyl acetate copolymer resin, butyral resin, silicone resin, epoxy resin, and fluorinated polyimide resin.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The joining layer contains at least one adhesive resin chosen from polyethylene, grafted polyethylene, ethylene-vinyl acetate copolymer resin, polytetrafluoroethylene, perfluoroalkoxy alkane, perfluoro(ethylene-propylene)copolymer, ethylene-tetrafluoroethylene copolymer, and polyvinylidene fluoride. The fluorine resin layer contains at least one of a polytetrafluoroethylene, perfluoroalkoxy alkane, perfluoro(ethylene-propylene)copolymer, ethylene-tetrafluoroethylene copolymer, and polyvinylidene fluoride.