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PROBLEM TO BE SOLVED : To provide a polyester resin composition to be formed into a molded body excellent in impact resistance and transparency.SOLUTION : A polyester resin composition comprises a polyester, and an isosorbide derivative represented by the general formula (1). In the general formula (1), Rand Rare each independently a single bond, an alkylene group, an arylene group, or a divalent group in which an alkylene group and an arylene group are liked.