NOVELTY - A back surface protection film (1) contains laminated material comprising infrared-permeability colored resin layer (11), white-colored colored resin layer (12) and weather resistance improvement layer (13) in order, and the infrared-permeability colored resin layer and weather resistance improvement layer forms the outermost layer of surface of the film. The infrared-permeability colored resin layer contains rubber containing aromatic vinyl-type resin having maximum glass transition temperature of 90-120 degrees C based on JIS K 7121, and infrared-permeability coloring agent.    USE - Back surface protection film is used for solar cell module (claimed) for outdoor, house and building roofs.    ADVANTAGE - The back surface protection film has excellent low thermal storage property, heat resistance property, flexibility, adhesiveness, designability, durability, weather resistance property, photoelectric conversion efficiency, solvent-proof property, productivity, and generating efficiency.    DETAILED DESCRIPTION - A back surface protection film contains laminated material comprising infrared-permeability colored resin layer, white-colored colored resin layer and weather resistance improvement layer in order, and the infrared-permeability colored resin layer and weather resistance improvement layer forms the outermost layer of surface of the film. The absorption factor of the film is 60% or more with respect to light emitted to the surface of the infra-rd-permeability colored resin layer and has wavelength of 400-700 nm. The infrared-permeability colored resin layer contains rubber containing aromatic vinyl-type resin having maximum glass transition temperature of 90-120 degrees C based on JIS K 7121, and infrared-permeability coloring agent, and has thickness of 10-300 mu m. The white-colored colored resin contains crystalline resin and white-colored coloring agent, and has thickness of 10-400 mu m. when the white-colored colored resin layer is left to stand at 135 degrees C for 30 minutes, the change rate of dimension before and behind the exposure of film is plus minus 0.5% or less. The weather-resistance improvement layer contains fluorine resin, and has thickness of 10-300 mu m.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of back surface protective film.    Back surface protective film (1)    Infrared-permeability colored resin layer (11)    White-colored colored resin layer (12)    Weather-resistance improvement layer (13)    Resin layer (14)