NOVELTY - A solar cell back surface protection sheet (10) consists of 2 or more types of base materials, which are laminated through an adhesive agent (13). The adhesive agent contains a urethane resin obtained by mixing acrylic polyol, isocyanate compound, 3-glycidoxy propyl triethoxysilane, and tin octylate. The isocyanate compound contains 20-40 wt.% xylylene-diisocyanate monomer and 80-60 wt.% isocyanurate component of hexamethylene diisocyanate, with respect to 100 wt.% of total amount of xylylene-diisocyanate monomer and isocyanurate component of hexamethylene diisocyanate.    USE - Solar cell back surface protection sheet is used for solar cell module (claimed) e.g. silicon-system solar cell module, inorganic compound-system solar cell module and organic-type solar cell module.    ADVANTAGE - The solar cell back surface protection sheet has excellent adhesiveness. The occurrence of zipping and appearance defect of the solar cell module is suppressed.    DETAILED DESCRIPTION - A solar cell back surface protection sheet consists of 2 or more types of base materials, which are laminated through an adhesive agent. The adhesive agent contains a urethane resin obtained by mixing acrylic polyol, isocyanate compound, 3-glycidoxy propyl triethoxysilane, and tin octylate. The acrylic polyol is prepared by polymerizing a polymerizable monomer (A) containing monomer having hydroxyl group and a monomer (B) containing acrylonitrile. The amount of acrylonitrile contained in the monomer (B) is 5-15 wt.% with respect to 100 wt.% monomer (A). The isocyanate compound contains 20-40 wt.% xylylene-diisocyanate monomer and 80-60 wt.% isocyanurate component of hexamethylene diisocyanate, with respect to 100 wt.% of total amount of xylylene-diisocyanate monomer and isocyanurate component of hexamethylene diisocyanate. The equivalent ratio of isocyanate group derived from xylylene-diisocyanate monomer with respect to hydroxyl group derived from acrylic polyol and isocyanurate component of hexamethylene diisocyanate contained in the isocyanate compound is 1-3. An INDEPENDENT CLAIM is included for solar cell module, which consists of the solar cell back surface protection sheet.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of the solar cell back surface protection sheet.    Solar cell back surface protection sheet (10)    Film (11,12)    Adhesive agent (13)