The present invention provides the following polyethylene terephthalate resin composition, which is excellent in transparency, heat resistance, and heat-and-moisture resistance, has less generation of gel that becomes a film defect, and has less linear oligomers during melt processing. The amount of production can also be reduced, making it suitable for industrial material applications, especially mold release applications. A kind of polyethylene terephthalate resin composition, it is characterized in that, the content of manganese element is 30~60ppm, the content of potassium element is 2~10ppm, the content of antimony element is 70~150ppm, and metal element and The molar ratio (M / P=(M1+M2 / 2) / P) of the amount of phosphorus element satisfies the following formula, and the gelation rate is 5% by weight or less. 0.6≤(M1+M2 / 2) / P≤1.3 (M1: content of divalent metal elements selected from Mg, Mn, and Ca (mol / t), M2: monovalent metals selected from Li, Na, and K Element content (mol / t), P: phosphorus element content (mol / t)).