A back contact solar cell module, comprising: - a back sheet; - a circuit sheet laminated on the back sheet, the circuit sheet having an interconnection pattern on a front surface thereof; - an insulating-layer-provided sealing material having a through-hole, the insulating-layer-provided sealing material being laminated on the circuit sheet; - a back contact cell formed on the insulating-layer-provided sealing material, the back contact cell having a cell electrode on a rear surface thereof; - a transparent sealing material laminated to cover the insulating-layer-provided sealing material and the back contact cell; - a transparent base material laminated on the transparent sealing material; and - a conductive paste provided in the through-hole, the conductive paste electrically and physically connecting the cell electrode and the interconnection pattern to each other; characterized in that the insulating-layer-provided sealing material is constituted by an insulating film and a pair of sealing material layers (2a, 2b) provided on both surfaces of the insulating film; the pair of sealing material layers (2a, 2b) is construed by a cell side sealing material layer provided on the front surface of the insulating film and a circuit sheet sealing material layer provided on a rear surface of the insulating film; wherein the thickness of the cell side sealing material layer is in a range of 10 μm to 500 μm; wherein the cell side sealing material layer comprises EVA (ethylene-vinyl acetate copolymer), EMMA (ethylene-methyl methacrylate copolymer), EAA (ethylene-acrylate copolymer), ionomer, PVB (polyvinyl butyral), or a silicon resin; wherein the circuit sheet sealing material layer comprises EVA (ethylene-vinyl acetate copolymer), EMMA (ethylene-methyl methacrylate copolymer), EAA (ethylene-acrylate copolymer), ionomer, PVB (polyvinyl butyral), or a silicon resin; and wherein the insulating film contains a stretched polyester film, a stretched polyamide film, a fluorine film or a polyimide film or at least one of polypropylene (homo, random, block) and polyethylene which is thermally fusible to a sealing material resin. - a back sheet; - a circuit sheet laminated on the back sheet, the circuit sheet having an interconnection pattern on a front surface thereof; - an insulating-layer-provided sealing material having a through-hole, the insulating-layer-provided sealing material being laminated on the circuit sheet; - a back contact cell formed on the insulating-layer-provided sealing material, the back contact cell having a cell electrode on a rear surface thereof; - a transparent sealing material laminated to cover the insulating-layer-provided sealing material and the back contact cell; - a transparent base material laminated on the transparent sealing material; and - a conductive paste provided in the through-hole, the conductive paste electrically and physically connecting the cell electrode and the interconnection pattern to each other; characterized in that the insulating-layer-provided sealing material is constituted by an insulating film and a pair of sealing material layers (2a, 2b) provided on both surfaces of the insulating film; the pair of sealing material layers (2a, 2b) is construed by a cell side sealing material layer provided on the front surface of the insulating film and a circuit sheet sealing material layer provided on a rear surface of the insulating film; wherein the thickness of the cell side sealing material layer is in a range of 10 μm to 500 μm; wherein the cell side sealing material layer comprises EVA (ethylene-vinyl acetate copolymer), EMMA (ethylene-methyl methacrylate copolymer), EAA (ethylene-acrylate copolymer), ionomer, PVB (polyvinyl butyral), or a silicon resin; wherein the circuit sheet sealing material layer comprises EVA (ethylene-vinyl acetate copolymer), EMMA (ethylene-methyl methacrylate copolymer), EAA (ethylene-acrylate copolymer), ionomer, PVB (polyvinyl butyral), or a silicon resin; and wherein the insulating film contains a stretched polyester film, a stretched polyamide film, a fluorine film or a polyimide film or at least one of polypropylene (homo, random, block) and polyethylene which is thermally fusible to a sealing material resin.