Protective sheet 1 for solar cells comprises a base material 11 and a thermoplastic resin layer 12 laminated on at least one surface of the base material 11. The thermoplastic resin layer 12 comprises a first layer 121 laminated on the base material 11 and a second layer 122 laminated on the first layer 121. The first layer 121 contains as the main component a copolymer of ethylene and at least one type selected from the group consisting of (meth)acrylic acid, (meth)acrylic acid ester, glycidyl (meth)acrylate and vinyl acetate. The second layer 122 contains an olefin-based resin as the main component. The protective sheet 1 for solar cells has excellent adhesiveness between the base material and the thermoplastic resin layer and can suppress the warping caused in a solar cell module.