The present invention provides a thermoplastic resin composition with an excellent mechanical strength, heat resistance and flame-retardant properties and, particularly, is preferably used for a thin-walled molding material. (A) a thermoplastic resin which does not form an anisotropic melt phase 100 weight parts is compounded with (B) a liquid crystalline polymer capable of forming an anisotropic melt phase 15 to 45 weight parts, (C) a flame-retardant component including (C-1) a phosphor-based flame-retardant agent 5 to 20 weight parts and (C-2) a silicone rubber 1 to 15 weight parts, wherein the ratio (C-1)/(C-2) ranges from 1 to 2, and (D) a filler 10 to 80 weight parts.