Patent ID: 7790069

Claim:
A flame-retardant thermoplastic resin composition comprising at least a plant-derived resin which is a polylactic acid resin (A) and a flame retardant (B), wherein the weight proportions of the individual components in the flame-retardant thermoplastic resin composition are: 30≦W 1 <55.5 44.5<X 1 ≦70 wherein W 1 is the percentage by mass of the plant-derived resin (A) and X 1 is the percentage by mass of the flame retardant (B), 90% by mass or more of the flame retardant (B) comprises aluminum hydroxide containing sodium oxide in an amount of 0.2% by mass or less, and the number average molecular weight of the polylactic acid resin is at least 30,000.