To provide a polylactic acid resin composition which holds excellent transparency and is excellent in breeding resistance, impact resistance, heat resistance, and moldability.

Provided is a polylactic acid resin composition comprising polylactic acid (A), a polyester-based block copolymer (B), and an amide-based compound (C), characterized in that the amide-based compound (C) is a trimesic acid triamide compound represented by general formula (1).