NOVELTY - An easily-adhesive back surface protection sheet (6) comprises an easily-bonding layer formed on single surface of a base material. The easily-bonding layer comprises cross-linked resin obtained using main ingredient resin, comprising glycol-modified polycarbonate polyurethane (E) cross-linked with isocyanate-type cross-linking agent. The main ingredient resin comprises aliphatic polycarbonate diol compound (A), diisocyanate compound (B), 2-10C alkylene diol compound (C) and modified isocyanate compound (D) which has three or more isocyanate groups in a molecule.    USE - Easily-adhesive back surface protection sheet is used for solar cell module (claimed).    ADVANTAGE - The easily-adhesive back surface protection sheet has high adhesiveness with sealing material, transparency and durability in high temperature and high humid environment.    DETAILED DESCRIPTION - An easily-adhesive back surface protection sheet comprises an easily-bonding layer formed on single surface of a base material. The easily-bonding layer comprises cross-linked resin obtained using main ingredient resin, comprising glycol-modified polycarbonate polyurethane (E) cross-linked with isocyanate-type cross-linking agent. The main ingredient resin comprises aliphatic polycarbonate diol compound (A), diisocyanate compound (B), 2-10C alkylene diol compound (C) and modified isocyanate compound (D) which has three or more isocyanate groups in a molecule. The content of component (C) with respect to total content of components (A)-(D) is 6-12 parts mass. The content of component (D) with respect to total content of components (A)-(D) is 2-4 parts mass. An INDEPENDENT CLAIM is included for laminated solar cell module (1), which has easily-adhesive back surface protection sheet and sealing material sheet (5) comprising ethylene-vinyl acetate copolymer adhering through the easily bonding layer.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic sectional view of solar cell module.    Solar cell module (1)    Transparent front substrate (2)    Front sealing material sheet (3)    Solar cell element (4)    Sealing material sheet (5)    Easily-adhesive back surface protection sheet (6)