PROBLEM TO BE SOLVED: To provide a polylactic acid-based resin composition capable of efficiently obtaining an injection foam molded body having excellent heat resistance and satisfactory strength, and an injection foam molded body obtained by using the resin composition.;SOLUTION: Provided is a polylactic acid-based resin composition for injection foaming, to 100 pts.mass of a polylactic acid resin (A), containing a crystal nucleus agent (B) of 0.1 to 10 pts.mass, and simultaneously satisfying the following conditions of (1) to (3): (1) that a crystallization speed index is 0.3 to 20 (min), (2) that the content of the D body in the polylactic resin (A) is 2.0 mol% or lower or 98.0 mol or higher, and (3) that the melt viscosity measured under the conditions of 190°C and 21.6 N is 0.1 to 30 g/10 min, and a foaming agent (C) is contained by 0.01 to 2 pts.mass to 100 pts.mass of the composition.;COPYRIGHT: (C)2015,JPO&INPIT
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