Polyester resin composition

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PROBLEM TO BE SOLVED : To provide a polyester resin composition which achieves good oxidation degradation resistance and hydrolysis resistance. SOLUTION : A polyester resin composition contains a copper element (A) and at least one metal element (B) selected from a first transition element excluding a group 2 element and a copper element and a rare earth element, has a content of (C) a phosphorus element of 1.5 mol/t or more and 4.5 mol/t or less, and satisfies expression (I) : ΔCOOH1≤60eq/t. In expression (I), ΔCOOH1 represents a carboxyl group terminal increment when treated at 200°C under air atmosphere for 24 hours. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT