An object is to provide a thermoplastic resin composition capable of providing a molded article having a large tensile strain. The object is achieved by a thermoplastic resin composition comprising a P3HA-based resin component (A) comprising a P3HA-based copolymer (a-1) having a weight average molecular weight of 200,000 to 1,000,000 and a P3HA-based copolymer (a-2) having a weight average molecular weight larger than that of the copolymer (a-1), and crosslinked resin particles (B) comprising a polyhydroxyalkanoate-based resin and having a gel fraction of 50% or more.