Patent ID: 7901764

Claim:
A multi-layered polylactic acid resin foamed body which is a laminate comprising a polylactic acid resin foamed layer and a thermoplastic resin layer provided at least one side of said foamed layer, wherein said foamed layer has such a cell shape as to satisfy the following formulas (1) to (3): 0.05<Z<2.0 (1) 0.2 <Z/X< 1.4 (2) 0.2 <Z/Y< 1.7 (3) where X, Y and Z represent average cell diameters in the extrusion, transverse and thickness directions, respectively, in the unit of mm, wherein a difference (ΔH endo:2° C./min −ΔH exo:2° C./min ) between an endothermic calorific value (ΔH endo:2° C./min ) and an exothermic calorific value (ΔH endo:2° C./min ) of said foamed layer as measured by heat flux differential scanning calorimetry at a heating rate of 2° C./min is less than 20 J/g and wherein the endothermic calorific value (ΔH endo:2° C./min ) is at least 25 J/g and the exothermic calorific value (ΔH exo:2° C./min ) is at least 15 J/g.