Disclosed is a polyacetal resin composition which has excellent workability and stability and, when molded into an article, which is remarkably reduced in the amount of aldehyde generated from the article and shows no leaching out of any compounded component from the article. Specifically disclosed is a polyacetal resin composition comprising (A) 100 parts by weight of a polyacetal copolymer having 1.0 mmol/kg or less of a hemiformal terminal group, 0.5 mmol/kg or less of a formyl terminal group and 0.5% by weight of an unstable terminal group, (B) 0.01 to 3 parts by weight of a hindered phenol-type antioxidant, (C) 0.01 to 1 part by weight of a hydrazide compound, and (D) 0.01 to 1 part by weight of a compound selected from the group consisting of an isocyanate compound, an isothiocyanatecompound and a modified form thereof.