To provide a polyacetal resin composition excellent in heat stability and suppressing the generation amount of formaldehyde and reduction of mechanical strength although it is colored by a pigment.

In the polyacetal resin composition, 0.01-5 pts.wt. of a coloring agent selected from inorganic and organic pigments, 0.01-3 pts.wt. of a polyether ester amide resin, 0.01-1 pts.wt. of a dihydrazide compound selected from the group consisting of an aromatic dihydrazide compound and an aliphatic dihydrazide compound having a solubility relative to 100 g of water at 20°C of less than 1 g, and 0.01-1 pts.wt. of a steric hindrance phenol compound are included in 100 pts.wt. of a polyacetal resin.