Abstract: A resin composition includes 100 parts by weight of a polyacetal copolymer, the amount of oxyalkylene units having 2 or more carbon atoms contained in the polyacetal copolymer is, per 100 mol of oxymethylene units of the polyacetal copolymer, 0.4 to 17.0 mol, relative to 100 parts by weight of the polyacetal copolymer, 0.01 to 1.0 part by weight of an amine-substituted triazine compound, 0.01 to 5.0 parts by weight of a hindered phenol, 0.001 to 3.0 parts by weight of a hindered amine, and 0.001 to less than 0.005 part by weight of at least one metal-containing compound selected from the group consisting of a hydroxide, an inorganic acid salt, and an alkoxide of an alkali metal or an alkaline earth metal.