A method for producing expanded polyolefin resin beads, comprising: a step of preparing preliminary resin particles containing a polyolefin resin and having a particle weight of 0.2 μg or more and 50 μg or less; a step of heat-treating the preliminary resin particles at a temperature that is higher by from 12 to 25°C than the melting point of the preliminary resin particles, so as to produce resin particles having a peak temperature (T 1) of the melting peak on first heating in a DSC curve obtained by heating the resin particles from 20°C to 200°C at a heating rate of 10°C/min that is higher by from 1.5 to 10°C than the peak temperature (T 2) of the melting peak on second heating in a DSC curve obtained by, subsequent to the first heating, cooling the resin particles from 200°C to 20°C at a cooling rate of 10°C/min, and then heating the resin particles from 20°C to 200°C at a heating rate of 10°C/min (heat-treating step), a step of dispersing the resin particles in a dispersion medium within a closed vessel (dispersing step); a step of impregnating the resin particles with a blowing agent at a temperature of the softening point of the resin particles or higher within a closed vessel (blowing agent impregnating step); a step of heating the dispersion medium having the resin particles dispersed therein to a temperature within a range of a temperature that is lower by 15°C than the melting point (Tm) of the resin particles or more and less than the melting end temperature (Te) where the resin particles are completely melted, and retaining at the temperature for from 10 to 60 minutes (retaining step); and a step of, after the retaining step, controlling the temperature of the dispersion medium to a temperature within a range of from (Tm - 5°C) to (Te + 5°C), and at that temperature, discharging the resin particles containing the blowing agent from the vessel to a low pressure area, thereby expanding the resin particles, so as to provide expanded beads having two melting peaks in a DSC curve obtained by heating the expanded beads from 20°C to 200°C at a heating rate of 10°C/min (expanding step). a step of preparing preliminary resin particles containing a polyolefin resin and having a particle weight of 0.2 μg or more and 50 μg or less; a step of heat-treating the preliminary resin particles at a temperature that is higher by from 12 to 25°C than the melting point of the preliminary resin particles, so as to produce resin particles having a peak temperature (T 1) of the melting peak on first heating in a DSC curve obtained by heating the resin particles from 20°C to 200°C at a heating rate of 10°C/min that is higher by from 1.5 to 10°C than the peak temperature (T 2) of the melting peak on second heating in a DSC curve obtained by, subsequent to the first heating, cooling the resin particles from 200°C to 20°C at a cooling rate of 10°C/min, and then heating the resin particles from 20°C to 200°C at a heating rate of 10°C/min (heat-treating step), a step of dispersing the resin particles in a dispersion medium within a closed vessel (dispersing step); a step of impregnating the resin particles with a blowing agent at a temperature of the softening point of the resin particles or higher within a closed vessel (blowing agent impregnating step); a step of heating the dispersion medium having the resin particles dispersed therein to a temperature within a range of a temperature that is lower by 15°C than the melting point (Tm) of the resin particles or more and less than the melting end temperature (Te) where the resin particles are completely melted, and retaining at the temperature for from 10 to 60 minutes (retaining step); and a step of, after the retaining step, controlling the temperature of the dispersion medium to a temperature within a range of from (Tm - 5°C) to (Te + 5°C), and at that temperature, discharging the resin particles containing the blowing agent from the vessel to a low pressure area, thereby expanding the resin particles, so as to provide expanded beads having two melting peaks in a DSC curve obtained by heating the expanded beads from 20°C to 200°C at a heating rate of 10°C/min (expanding step).