A surface protection film, comprising: a backing film; and a pressure-sensitive adhesive layer provided on one side of the backing film and made from an aqueous dispersion-type pressure-sensitive adhesive, wherein the aqueous dispersion-type pressure-sensitive adhesive comprises an acryl-based polymer comprising a monomer unit or units derived from a monomer composition containing an alkyl (meth)acrylate as a main component; and another acryl-based polymer having a glass transition temperature higher than that of the acryl-based polymer and comprising a monomer unit or units derived from a monomer composition containing 75% by weight or more of an alkyl (meth) acrylate capable of forming a homopolymer with a glass transition temperature of 20 °C or more, the aqueous dispersion-type pressure-sensitive adhesive contains the acryl-based polymers and in a weight ratio / of 95/5 to 40/60, and the pressure-sensitive adhesive layer has a glass transition temperature peak detected at -20°C or less and a glass transition temperature peak detected at 30°C to 190°C as measured by differential scanning calorimetry. wherein the pressure-sensitive adhesive layer has an ethyl acetate-insoluble component content of 80% by weight or more, determined according to the method in the experimental part; wherein the sol of the acryl-based polymer has a weight average molecular weight of 40,000 to 750,000, wherein the sol of the acryl-based polymer has a weight average molecular weight of 200,000 to 4,800,000, and wherein the weight average molecular weight is determined by Gel Permeation Chromatography with tetrahydrofuran or dimethyl formamide solvent. a backing film; and a pressure-sensitive adhesive layer provided on one side of the backing film and made from an aqueous dispersion-type pressure-sensitive adhesive, wherein the aqueous dispersion-type pressure-sensitive adhesive comprises an acryl-based polymer comprising a monomer unit or units derived from a monomer composition containing an alkyl (meth)acrylate as a main component; and another acryl-based polymer having a glass transition temperature higher than that of the acryl-based polymer and comprising a monomer unit or units derived from a monomer composition containing 75% by weight or more of an alkyl (meth) acrylate capable of forming a homopolymer with a glass transition temperature of 20 °C or more, the aqueous dispersion-type pressure-sensitive adhesive contains the acryl-based polymers and in a weight ratio / of 95/5 to 40/60, and the pressure-sensitive adhesive layer has a glass transition temperature peak detected at -20°C or less and a glass transition temperature peak detected at 30°C to 190°C as measured by differential scanning calorimetry. wherein the pressure-sensitive adhesive layer has an ethyl acetate-insoluble component content of 80% by weight or more, determined according to the method in the experimental part; wherein the sol of the acryl-based polymer has a weight average molecular weight of 40,000 to 750,000, wherein the sol of the acryl-based polymer has a weight average molecular weight of 200,000 to 4,800,000, and wherein the weight average molecular weight is determined by Gel Permeation Chromatography with tetrahydrofuran or dimethyl formamide solvent.