NOVELTY - A back surface protection sheet comprises 1st surface layer (1), 2nd surface layer (2), and inner layer (3) which is not located on the surface. The 1st surface layer is film consisting of polyolefin film, ethylene vinyl acetate copolymer film, and/or fluorine-type film; and the 2nd surface layer contains large particle size white pigment (A1) with average particle diameter of 0.38-2 microns or small particle size white pigment (A2) with average particle diameter of 0.2-0.38 microns, hardening weather-resistance protective layer (B) with 60-100 wt.% solvent-soluble content, or fluorine-type film.    USE - A back surface protection sheet for solar cells (claimed).    ADVANTAGE - The light having wavelength of 400-4000 nm can be reflected efficiently, and energy conversion efficiency of solar cell is increased. When back surface protective material for solar cells reflects near infrared ray transmitted without the ability to absorb a solar cell element, the solar cell module can prevent temperature increase of the back surface protective material and suppress decline in the energy conversion efficiency of a solar cell element.    DETAILED DESCRIPTION - A back surface protection sheet comprises 1st surface layer, 2nd surface layer, and inner layer which is not located on the surface. The 1st surface layer is a film consisting of polyolefin film, ethylene vinyl acetate copolymer film, and/or fluorine-type film; the 2nd surface layer contains large particle size white pigment (A1) with average particle diameter of 0.38-2 microns or small particle size white pigment (A2) with average particle diameter of 0.2-0.38 microns, hardening weather-resistance protective layer (B) with 60-100 wt.% solvent-soluble content, fluorine-type film (C), or polyester film (F); and the inner layer (3) contains white curable adhesive bond layer (D) consisting of large particle size white pigment (A1) or small particle size white pigment (A2). An INDEPENDENT CLAIM is included for solar cell module comprising solar cell surface protective material (I) located on light-receiving surface side of solar cell, sealing material (II) located on light-receiving surface side of solar cell, solar cell element (III), sealing material (IV) located on non-light-receiving surface side of solar cell, and solar cell back surface protective material (V) located on non-light-receiving surface side of solar cell in which solar cell back surface protective material (V) is arranged so that surface layer (1) contacts the sealing material (IV) at the side of non-light-receiving surface.