A solar cell back sheet and a solar cell module

The present invention provides a low-cost manufacturing, adhesiveness between the respective components is excellent, and the weather resistance and excellent water vapor barrier backsheet for a solar cell. In the solar cell comprises at least three-layer laminated structure of the backplane, the first layer is a polyester-based weather resistant resin film or fluorine-based resin film; a second layer formed from a modified polyolefin resin, having a thickness of 5 ~ 250μm polyolefin layer of said modified polyolefin resin is an epoxy group-containing vinyl monomer parts of 1 to 30 parts by weight of an aromatic vinyl monomer and 0.1 to 30 wt grafted to polyethylene, polypropylene, , or ethylene --100 parts by weight of a propylene copolymer obtained; the third layer is a polyester layer, a polyolefin layer, or aluminum foil; the total thickness of the second layer and the third layer is 30μm or more.