To provide a polyacetal resin composition excellent in suppression of formaldehyde generation, repeated impact resistance, and dimensional stability, after held at high temperature and high humidity.

This polyacetal resin composition is obtained from a raw material composition which includes a polyacetal resin, a first hydrazine derivative (B), and a hydrazine derivative (C) different from the first hydrazine derivative, wherein the mixture of the first hydrazine derivative (B) and the hydrazine derivative (C) different from the first hydrazine derivative does not show a melting point, when it is heated at a rate of temperature rise of 2.5°C/min using a differential scanning calorimeter; held for 2 min after melted; cooled to 100°C at a rate of 10°C/min; and thereafter heated at a rate of temperature rise of 2.5°C/min.