A polyacetal resin composition comprising 100 parts by mass of a polyacetal resin and 10 parts by mass or more and 100 parts by mass or less of a glass filler, wherein the polyacetal resin composition comprises at least one acid component as a sizing agent of the glass filler, when a polyacetal resin molded article made of the polyacetal resin composition is treated in following steps to, a remaining residue has an ignition loss of 0.2% by weight or more, as treated and calculated in following conditions (a) to (e) with thermogravimetric analysis: step of loading the polyacetal resin molded article into a mixed solvent of hexafluoroisopropanol (HFIP) and chloroform in 1/1 (volume ratio), and heating the resultant at 60°C for 1 hour for dissolution; step of removing a supernatant solution of the resulting solution to afford a residue, loading the resulting residue into a mixed solvent of HFIP and chloroform in 1/1 (volume ratio), and again heating the resultant at 60°C for 30 minutes to remove a supernatant solution; step of performing step three times in total, to provide a solvent-containing residue; and step of subjecting the solvent-containing residue to drying in vacuum at 30°C for 5 hours, to thereby provide the residue; and (a) temperature rise from 50 to 105°C at a rate of 30°C/min; (b) retention at 105°C for 30 minutes; (c) temperature rise from 105 to 625°C at a rate of 30°C/min; (d) retention at 625°C for 30 minutes; and (e) determination of, as an ignition loss, a value (% by weight) obtained by subtracting a mass after completion of (d) from a mass after completion of (b), dividing the resulting difference by a mass of the residue used for measurement, and multiplying the resulting quotient by 100, and, a remaining residue (D') after the polyacetal resin molded article is dipped in hot water at 80°C for one week and then treated in the steps to has an ignition loss of 0.2% by weight or more. the polyacetal resin composition comprises at least one acid component as a sizing agent of the glass filler, when a polyacetal resin molded article made of the polyacetal resin composition is treated in following steps to, a remaining residue has an ignition loss of 0.2% by weight or more, as treated and calculated in following conditions (a) to (e) with thermogravimetric analysis: step of loading the polyacetal resin molded article into a mixed solvent of hexafluoroisopropanol (HFIP) and chloroform in 1/1 (volume ratio), and heating the resultant at 60°C for 1 hour for dissolution; step of removing a supernatant solution of the resulting solution to afford a residue, loading the resulting residue into a mixed solvent of HFIP and chloroform in 1/1 (volume ratio), and again heating the resultant at 60°C for 30 minutes to remove a supernatant solution; step of performing step three times in total, to provide a solvent-containing residue; and step of subjecting the solvent-containing residue to drying in vacuum at 30°C for 5 hours, to thereby provide the residue; and (a) temperature rise from 50 to 105°C at a rate of 30°C/min; (b) retention at 105°C for 30 minutes; (c) temperature rise from 105 to 625°C at a rate of 30°C/min; (d) retention at 625°C for 30 minutes; and (e) determination of, as an ignition loss, a value (% by weight) obtained by subtracting a mass after completion of (d) from a mass after completion of (b), dividing the resulting difference by a mass of the residue used for measurement, and multiplying the resulting quotient by 100, and, a remaining residue (D') after the polyacetal resin molded article is dipped in hot water at 80°C for one week and then treated in the steps to has an ignition loss of 0.2% by weight or more. step of loading the polyacetal resin molded article into a mixed solvent of hexafluoroisopropanol (HFIP) and chloroform in 1/1 (volume ratio), and heating the resultant at 60°C for 1 hour for dissolution; step of removing a supernatant solution of the resulting solution to afford a residue, loading the resulting residue into a mixed solvent of HFIP and chloroform in 1/1 (volume ratio), and again heating the resultant at 60°C for 30 minutes to remove a supernatant solution; step of performing step three times in total, to provide a solvent-containing residue; and step of subjecting the solvent-containing residue to drying in vacuum at 30°C for 5 hours, to thereby provide the residue; and (a) temperature rise from 50 to 105°C at a rate of 30°C/min; (b) retention at 105°C for 30 minutes; (c) temperature rise from 105 to 625°C at a rate of 30°C/min; (d) retention at 625°C for 30 minutes; and (e) determination of, as an ignition loss, a value (% by weight) obtained by subtracting a mass after completion of (d) from a mass after completion of (b), dividing the resulting difference by a mass of the residue used for measurement, and multiplying the resulting quotient by 100, and, (a) temperature rise from 50 to 105°C at a rate of 30°C/min; (b) retention at 105°C for 30 minutes; (c) temperature rise from 105 to 625°C at a rate of 30°C/min; (d) retention at 625°C for 30 minutes; and (e) determination of, as an ignition loss, a value (% by weight) obtained by subtracting a mass after completion of (d) from a mass after completion of (b), dividing the resulting difference by a mass of the residue used for measurement, and multiplying the resulting quotient by 100, and, a remaining residue (D') after the polyacetal resin molded article is dipped in hot water at 80°C for one week and then treated in the steps to has an ignition loss of 0.2% by weight or more.