Disclosed is a resin composition containing a thermoplastic resin (A), a glass fiber (B) having a length/breadth ratio of the cross section of 1.5-10, and a flame retardant (C). The mass ratio between the thermoplastic resin (A) and the glass fiber (B) (A/B) is within the range from 30/70 to 95/5. A part or the entire of the thermoplastic resin (A) is composed of a polyamide 11 resin (A1a) or/and a polyamide 1010 resin (A1b). Per 100 parts by mass of the total of the thermoplastic resin (A) and the glass fiber (B), not less than 10 parts by mass of the polyamide 11 resin (A1a) or/and the polyamide 1010 resin (A1b) and 5-40 parts by mass of the flame retardant (C) are contained.
