To provide a novel thermoplastic resin composition capable of providing a molded article excellent in impact resistance and moldability. Provided is a thermoplastic resin composition comprising: a poly(3-hydroxyalkanoate)-based copolymer (A); crosslinked resin particles (B); and a poly(3-hydroxybutyrate) homopolymer (C), wherein the crosslinked resin particles (B) comprise a polyhydroxyalkanoate-based resin and have a gel fraction of 50% or more, and a weight ratio [(C)/(A)] of the poly(3-hydroxybutyrate) homopolymer (C) to the poly(3-hydroxyalkanoate)-based copolymer (A) is 0.05 or more and 0.4 or less.