To manufacture a resin molded article which includes few foreign matters such as fish eyes, and excellent in extrusion moldability and product appearance.

The resin molded article is manufactured by performing extrusion molding using a polyacetal resin and a polymer having an aliphatic ester structure, of which number of fish eyes is controlled to be a number not more than a predetermined number by filtering with a filter arranged in a breaker plate. The resin molded article is excellent in extrusion moldability and product appearance or the like, and especially in spinnability and film processability.

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