NOVELTY - A solar cell module (201) has a photovoltaic cell (205) in which positive electrode (203) and negative electrode (204) are formed on the back surface (202B) on the opposite side to light-receiving surface (202A), back surface side substrate (212) on which conductive layer (220) is formed, and layer insulation material (216). The layer insulation material and at least one surface of the conductive layer of the back surface side substrate consists of copper or nickel, and ethylene-( alpha )-olefin copolymer, ethylene-methyl acrylate copolymer, and organic peroxide.    USE - Solar cell module (claimed).    ADVANTAGE - The solar cell module has excellent durability and weather resistance, and suppressed time-dependent reduction in crosslinking characteristics.    DETAILED DESCRIPTION - A solar cell module has a photovoltaic cell in which positive electrode and negative electrode are formed on the back surface on the opposite side to light-receiving surface, back surface side substrate on which conductive layer is formed, provided on the surface at the side of photovoltaic cell while opening and opposingly arranged to the back surface and photovoltaic cell, and layer insulation material which seals the back surface side substrate and photovoltaic cell. The solar cell module of the back-contact system has electrical connection component which penetrates through layer insulation material and electrically connects the electrode and conductive layer. The layer insulation material and at least one surface of the conductive layer of the back surface side substrate consists of copper or nickel, and ethylene-( alpha )-olefin copolymer, ethylene-methyl acrylate copolymer, and organic peroxide.    DESCRIPTION OF DRAWING(S) - The drawing shows a typical longitudinal cross-sectional view of principal portion of the solar cell module.    Solar cell module (201)    Light-receiving surface (202A)    Back surface of silicon substrate (202B)    Positive electrode (203)    Negative electrode (204)    Photovoltaic cell (205)    Back surface side substrate (212)    Layer insulation material (216)    Conductive layer (220)