Polyester film and the solar battery back sheet using the same, a solar cell, and methods for their preparation

Long high over wet heat resistance and flame retardancy, other properties (in particular, ultraviolet resistance and light reflectivity, etc.) to provide a superior polyester film compatibility. Further, the polyester film by using, to provide a solar cell using the solar battery back sheet and it had a high durability. A laminated structure having a crystalline polyester and a polyester layer containing inorganic particles (P1 layer) and a crystalline polyester and a polyester layer containing an inorganic particle and hydrolysis stabilizer (P2 layer) containing inorganic particles in the P2 layer the amount Wa2 is, with respect to P2 layer is 10 mass% or more, the difference Wa2-Wa1 inorganic particle content Wa1 (mass%) in the inorganic particle content Wa2 (wt%) and P1 layers of P2 layer is 5 mass % or more and 25 mass% or less, the content Wb2 of hydrolysis stabilizer in the P2 layers, with respect to P2 layer is a polyester film is 1.5 wt% or less than 0.02 mass%.