A polyacetal resin composition comprising 100 parts by weight of a polyacetal polymer, 0.01 to 0.5 part by weight of a hydrazide compound, 0.01 to 0.1 part by weight of an amino-substituted triazine compound and 0.01 to 5 parts by weight of a hindered phenolic compound, wherein the resin composition has a total content of hydroxides, organic acid salts and inorganic acid salts of an alkali metal and an alkali earth metal of 50 ppm or less by weight in terms of the total of the alkali metal and the alkali earth metal; and a molded article thereof. The polyacetal resin composition greatly suppresses the emission of formaldehyde from a pellet or molded article thereof and rarely produces a mold deposit.