Sealing material for solar cell, protective sheet for solar cell, and process for production of solar cell module

A process for production of a solar cell module, comprising a lamination step in which a laminated body is produced by laminating a transparent top side protective material via a sealing material for a solar cell comprising 100 parts by weight of a modified butene-based resin that is produced by graft-modifying a butene-ethylene copolymer having a butene content of 1 to 25% by weight with maleic anhydride and has a total content of the maleic anhydride of 0.1 to 3% by weight, and 0.1 to 15 parts by weight of a silane compound having an epoxy group onto a top surface of a solar cell and laminating a bottom side protective material via a sealing material for a solar cell comprising 100 parts by weight of a modified butene-based resin that is produced by graft-modifying a butene-ethylene copolymer having a butene content of 1 to 25% by weight with maleic anhydride and has a total content of the maleic anhydride of 0.1 to 3% by weight, and 0.1 to 15 parts by weight of a silane compound having an epoxy group onto a bottom surface of the solar cell;

• and a sealing step in which the solar cell is sealed with the sealing materials for a solar cell by heating the laminated body while pressing the laminated body in its thickness direction.