a halogen - free flame - retardant polyamide composition which generates no halogen compound during combustion . the composition has excellent thermal stability during high - temperature molding and is capable of showing high flame retardancy when burned . the composition is effective in inhibiting steel materials , such as the screw or cylinder of an extruder or molding machine , from corroding or wearing . the flame - retardant polyamide composition in a preferred embodiment comprises 20 - 60 mass % polyamide resin , 5 - 40 mass % thermoplastic resin other than , 3 - 15 mass % flame retardant having no halogen radicals in the molecule , and 0 - 50 mass % reinforcement , wherein the thermoplastic resin satisfies the ul94v - 0 standards , the flame retardant is a phosphinic acid salt compound , and the sum of the thermoplastic resin and the flame retardant is 16 - 45 mass %.