To provide a back sheet for a solar cell, having low heat shrinkage properties, hardly causing deterioration in steam permeability even when subjected to heat treatment, inexpensive, and excellent in productivity.

A back sheet for a solar cell includes a laminate formed by laminating two sheets of films (b) and a film (c) on both sides of a hot melt-based adhesive layer (a). The back sheet for a solar cell has a curl amount of 10 mm/297 mm or less after a thermal shrinkage test, a thermal shrinkage of less than 3%, and a difference of thermal shrinkage of the film (b) and the film (C) of less than 1.5%. The laminate is preferably laminated by an extrusion lamination method.