A method for producing a bead expanded molded article, comprising: a step of preparing expandable resin particles composed of a resin composition including a resin and a blowing agent; a pre-expansion step of heat-expanding the expandable resin particles to obtain resin expanded particles; and an in-die molding step of heating the resin expanded particles in a molding cavity to perform secondary expansion, thereby thermally fusion-bonding said resin expanded particles, characterized in that the method comprises: a step of preparing the expandable resin particles by impregnating resin particles including mainly a resin having a glass transition temperature of 180°C or more with an organic-based physical blowing agent having a structure represented by the following formula (a) and having a boiling point of 120°C or less; wherein, R 1 and R 2 are an alkyl group of 1 to 6 carbon atoms, or an alkylene group of 1 to 6 carbon atoms, which is mutually bonded together with a carbon atom forming a carbonyl group to form a ring, and R 1 and R 2 may be the same or different in the number of carbons; a step of scattering the organic-based physical blowing agent from a surface of the expandable resin particles to reduce a difference in the concentration of the organic-based physical blowing agent between an inner part and a surface area part of the expandable resin particles; and performing the pre-expansion step using the expandable resin particles subjected to the reduction of the difference in the concentration, wherein the pre-expansion step is performed in a state where a DSC curve obtained by measurement with a differential scanning calorimeter from the expandable, resin particles exhibits at least two endotherms at not higher than a glass transition temperature of the resin which is a main component, and when a glass transition temperature of the resin is expressed by Tg (°C) and a boiling point of the organic-based physical blowing agent is expressed by Tb (°C), an initiation temperature of first endotherm among the two endotherms is Tb or more and Tb+100 °C or less, an initiation temperature of second endotherm is Tg-150°C or more and Tg-10°C or less, and a difference in the initiation temperature between the first endotherm and the second endotherm (T2-T1) is 52°C or less; wherein the glass transition temperature, the initiation temperature of first endotherm, and the initiation temperature of second endotherm are determined as disclosed in the description. a step of preparing expandable resin particles composed of a resin composition including a resin and a blowing agent; a pre-expansion step of heat-expanding the expandable resin particles to obtain resin expanded particles; and an in-die molding step of heating the resin expanded particles in a molding cavity to perform secondary expansion, thereby thermally fusion-bonding said resin expanded particles, characterized in that the method comprises: a step of preparing the expandable resin particles by impregnating resin particles including mainly a resin having a glass transition temperature of 180°C or more with an organic-based physical blowing agent having a structure represented by the following formula (a) and having a boiling point of 120°C or less; wherein, R 1 and R 2 are an alkyl group of 1 to 6 carbon atoms, or an alkylene group of 1 to 6 carbon atoms, which is mutually bonded together with a carbon atom forming a carbonyl group to form a ring, and R 1 and R 2 may be the same or different in the number of carbons; a step of scattering the organic-based physical blowing agent from a surface of the expandable resin particles to reduce a difference in the concentration of the organic-based physical blowing agent between an inner part and a surface area part of the expandable resin particles; and performing the pre-expansion step using the expandable resin particles subjected to the reduction of the difference in the concentration, wherein the pre-expansion step is performed in a state where a DSC curve obtained by measurement with a differential scanning calorimeter from the expandable, resin particles exhibits at least two endotherms at not higher than a glass transition temperature of the resin which is a main component, and when a glass transition temperature of the resin is expressed by Tg (°C) and a boiling point of the organic-based physical blowing agent is expressed by Tb (°C), an initiation temperature of first endotherm among the two endotherms is Tb or more and Tb+100 °C or less, an initiation temperature of second endotherm is Tg-150°C or more and Tg-10°C or less, and a difference in the initiation temperature between the first endotherm and the second endotherm (T2-T1) is 52°C or less; wherein the glass transition temperature, the initiation temperature of first endotherm, and the initiation temperature of second endotherm are determined as disclosed in the description.