A method for producing expanded particles of a polypropylene resin, the method comprising: a step including dispersing particles of the polypropylene resin in an aqueous dispersion medium in a pressure-resistant container, introducing a foaming agent into the pressure-resistant container, and impregnating the particles of the polypropylene resin with the foaming agent under heat and pressure, the polypropylene resin being obtained by mixing not less than 1 part by weight and not more than 10 parts by weight of a polyethylene resin, which has a density of 0.945 g/cm 3 or greater and less than 0.980 g/cm 3, to 100 parts by weight of a polypropylene resin, the polypropylene resin having a high-temperature-side crystal melting peak temperature of 146°C or above and 160°C or below, and a step including releasing the particles of the polypropylene resin into a foaming atmosphere having a pressure lower than an internal pressure of the pressure-resistant container and having a foaming atmosphere temperature of 90°C or above and 105°C or below to allow the particles of the polypropylene resin to expand, thereby obtaining the expanded particles of the polypropylene resin, the expanded particles of the polypropylene resin having an expansion ratio of 20 times or greater and 40 times or less, a closed cell ratio of 90% or greater, and a percentage of wrinkle-induced shrinkage of 5% or less, the expanded particles of the polypropylene resin being produced through a single expansion process, the percentage of wrinkle-induced shrinkage being calculated using the following equation: Percentage of weinkle − induced shrinkage % = 100 × 1 − v / v ′, where v represents a volume (cm 3) of expanded particles submerged in ethanol, and v' represents a volume (cm 3) of the expanded particles submerged in ethanol measured after placing the expanded particles in a hermetically closable pressure-resistant container and imparting an internal pressure of 0.20 MPa (absolute pressure) to the expanded particles by raising a pressure inside the hermetically closable pressure-resistant container to 0.30 MPa (gage pressure) at a rate of not more than 0.1 MPa/60 minutes; and wherein the high-temperature-side crystal melting peak temperature is the peak at the highest temperature on a DSC curve. a step including dispersing particles of the polypropylene resin in an aqueous dispersion medium in a pressure-resistant container, introducing a foaming agent into the pressure-resistant container, and impregnating the particles of the polypropylene resin with the foaming agent under heat and pressure, the polypropylene resin being obtained by mixing not less than 1 part by weight and not more than 10 parts by weight of a polyethylene resin, which has a density of 0.945 g/cm 3 or greater and less than 0.980 g/cm 3, to 100 parts by weight of a polypropylene resin, the polypropylene resin having a high-temperature-side crystal melting peak temperature of 146°C or above and 160°C or below, and a step including releasing the particles of the polypropylene resin into a foaming atmosphere having a pressure lower than an internal pressure of the pressure-resistant container and having a foaming atmosphere temperature of 90°C or above and 105°C or below to allow the particles of the polypropylene resin to expand, thereby obtaining the expanded particles of the polypropylene resin, the expanded particles of the polypropylene resin having an expansion ratio of 20 times or greater and 40 times or less, a closed cell ratio of 90% or greater, and a percentage of wrinkle-induced shrinkage of 5% or less, the expanded particles of the polypropylene resin being produced through a single expansion process, the percentage of wrinkle-induced shrinkage being calculated using the following equation: Percentage of weinkle − induced shrinkage % = 100 × 1 − v / v ′, where v represents a volume (cm 3) of expanded particles submerged in ethanol, and v' represents a volume (cm 3) of the expanded particles submerged in ethanol measured after placing the expanded particles in a hermetically closable pressure-resistant container and imparting an internal pressure of 0.20 MPa (absolute pressure) to the expanded particles by raising a pressure inside the hermetically closable pressure-resistant container to 0.30 MPa (gage pressure) at a rate of not more than 0.1 MPa/60 minutes; and wherein the high-temperature-side crystal melting peak temperature is the peak at the highest temperature on a DSC curve. v represents a volume (cm 3) of expanded particles submerged in ethanol, and v' represents a volume (cm 3) of the expanded particles submerged in ethanol measured after placing the expanded particles in a hermetically closable pressure-resistant container and imparting an internal pressure of 0.20 MPa (absolute pressure) to the expanded particles by raising a pressure inside the hermetically closable pressure-resistant container to 0.30 MPa (gage pressure) at a rate of not more than 0.1 MPa/60 minutes; and wherein the high-temperature-side crystal melting peak temperature is the peak at the highest temperature on a DSC curve.