Polyamide resin foamed particles and method for producing same

A polyamide-based resin expanded bead comprising a foam layer formed by expanding a polyamide-based resin, wherein

• on a first DSC curve and a second DSC curve obtained under the following condition 1, the first DSC curve has a melting peak (intrinsic peak) inherent in the polyamide-based resin and a melting peak (high temperature peak) at a higher temperature side than the intrinsic peak, and, the peak top temperature of the melting peak of the second DSC curve is 180° C. or higher and 280° C. or lower, and
• the polyamide-based resin expanded bead has an apparent density of 10 to 300 kg/m3 and a closed cell ratio of 85% or more:
• Condition 1
• A DSC curve measured when a foam layer of a polyamide-based resin expanded bead as a test piece is heated and melted from 30° C. to a temperature 30° C. higher than a temperature at the end of a melting peak at a heating rate of 10° C./min is defined as a first DSC curve, and a DSC curve measured when the test piece is then retained at the temperature for 10 minutes, cooled to 30° C. at a cooling rate of 10° C./min, and heated and melted again to a temperature 30° C. higher than the temperature at the end of the melting peak at a heating rate of 10° C./min is defined as a second DSC curve, each curve being measured based on heat-flux differential scanning calorimetry in accordance with JIS K7121-1987.