NOVELTY - A coating liquid comprising primary resin main component containing polycarbonate and secondary resin main component containing hydroxyl group, polyisocyanate compound and solvent is coated on the surface of base material layer (60) to form a weather-resistant coating layer (61) to obtain back surface protection sheet (6). The content of isocyanate group of polyisocyanate compound with respect to 100 parts mass of secondary resin main component is 0.8-14 parts mass. The solvent is a mixture of main solvent and/or auxiliary solvent.    USE - Manufacture of back surface protection sheet used for solar cell module (all claimed).    ADVANTAGE - The method provides back surface protection sheet having excellent durability. The solar cell module containing the surface protection sheet has excellent weather resistance, and high adhesiveness between sealing materials.    DETAILED DESCRIPTION - A coating liquid comprising primary resin main component containing polycarbonate and secondary resin main component containing hydroxyl group, polyisocyanate compound and solvent is coated on the surface of base material layer to form a weather-resistant coating layer to obtain back surface protection sheet. The content of isocyanate group of polyisocyanate compound with respect to 100 parts mass of secondary resin main component is 0.8-14 parts mass. The hydroxyl value of secondary resin main component is 18-100. The solvent is a mixture of main solvent and/or auxiliary solvent. The content of main solvent with respect to 100 parts mass of solvent is 50-100 parts mass. The solubility parameter of main solvent is 19.3-20.3. The content of auxiliary solvent with respect to 100 parts mass of solvent is 0-50 parts mass. The solubility parameter of auxiliary solvent is 22 or more. An INDEPENDENT CLAIM is included for solar cell module, which consists of weather-resistant coating layer of back surface protection sheet provided on outermost layer of solar cell module, sealing material and solar cell element.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of laminate of back surface protection sheet for solar cell module.    Back surface protection sheet (6)    Base material layer (60)    Weather-resistant coating layer (61)