NOVELTY - A back surface protective film (1) comprises laminated body of infrared-permeability colored resin layer (11) which has thickness of 10-300 mu m and contains rubber consisting of aromatic-vinyl-type resin with maximum glass transition temperature measured according to JIS K 7121 of 90-120 degrees C and infrared-permeability coloring agent, white-colored colored resin layer (12) which has thickness of 10-400 mu m and contains white-colored coloring agent, metal layer (13), and weather-resistance improvement layer (14).    USE - A back surface protective film for solar cells used for solar cell module (all claimed).    ADVANTAGE - The back surface protective film for solar cells has excellent low thermal storage property, heat resistance, flexibility, adhesiveness with a component containing ethylene-vinyl acetate copolymer, durability with respect to cooling-heat cycle, moisture-permeability-proof property, and weather resistance, heat deformation is suppressed, and photoelectric conversion efficiency of solar cell is improved.    DETAILED DESCRIPTION - A back surface protective film (1) comprises laminated body of infrared-permeability colored resin layer (11) which has thickness of 10-300 mu m and contains rubber consisting of aromatic-vinyl-type resin with maximum glass transition temperature measured according to JIS K 7121 of 90-120 degrees C and infrared-permeability coloring agent, white-colored colored resin layer (12) which has thickness of 10-400 mu m and contains white-colored coloring agent with change rate of dimension of less than or equal to 0.5% before and after leaving to stand at 135 degrees C for 30 minutes, metal layer (13), and weather-resistance improvement layer (14) which has thickness of 10-300 mu m and contains fluorine resin. The film has absorption factor with respect to light of greater than or equal to 60% when light with wavelength of 400-700 nm is radiated to the surface of the infrared-permeability colored resin layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of a back surface protective film for solar cells.    Back surface protective film for solar cells (1)    Infrared-permeability colored resin layer (11)    White-colored colored resin layer (12)    Metal layer (13)    Weather-resistance improvement layer (14)