To provide a polyacetal resin composition containing polylactic acid excellent in flexural modulus, hydrolysis resistance, and surface smoothness, and a molding.

The polyacetal resin composition includes: more than 50 mass% and at most 90 mass% of a polyacetal resin (A); at least 10 mass% and less than 50 mass% of a polylactic acid resin (B), based on 100 mass% of total of (A) and (B); and 10-100 pts.mass of a fibrous filler (C) based on 100 pts.mass of (A) and (B).