Disclosed is a backside protective film (1) for a solar cell, which sequentially has a first resin layer (11), a second resin layer (12) and a third resin layer (13). Both the first resin layer and second resin layer include a rubber containing reinforced aromatic vinyl-based resin having a maximum glass transition temperature of 90-120° C. and have a thickness of 10-300 μm. The first resin layer includes an infrared transmissible coloring agent, while the second resin layer includes a white-based coloring agent. The third resin layer includes a saturated polyester resin and has a thickness of 10-300 μm. The third resin layer has a dimension change ratio between before and after the film is left to stand still at a temperature of 135° C. for 30 minutes of ±0.5% or less.