NOVELTY - An easily-bonding layer composition comprises crosslinking resin main ingredient, polyisocyanate compound which crosslinks crosslinking resin, silane coupling agent and organometallic coordination compound. The silane coupling agent contains mercapto group-containing silane coupling agent and/or epoxy group-containing silane coupling agent. The easily-bonding layer composition forms an easily-bonding layer on surface of back surface protection sheet (6) for solar-cell module (1).    USE - Easily-bonding layer composition is used for forming easily-bonding layer on surface of back surface protection sheet for solar-cell module (all claimed).    ADVANTAGE - The sheet containing the composition has excellent adhesiveness, blocking resistance with respect to sealing material and weather resistance, and suppressed variation in quality.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) back surface protection sheet, which has easily-bonding layer formed on one side. The easily-bonding layer is formed by carrying out film formation process using coating liquid containing the easily-bonding layer composition on single surface of the back surface protection sheet;    (2) manufacture of easily-adhesive back surface protection sheet, which involves applying the coating liquid to one side of resin base material, and forming easily-bonding layer by carrying out film formation of coating liquid; and    (3) solar-cell module, which has integrated easily-adhesive back surface protection sheet, sealing material and solar-cell element (4). The easily-adhesive back surface protection sheet and the sealing material containing polyethylene-type resin are integrated through the easily-bonding layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the solar-cell module.    Solar-cell module (1)    Transparent front substrate (2)    Front side sealing material layer (3)    Solar-cell element (4)    Back surface protection sheet (6)