Polyester resin

A polyester resin having a structure in which a dicarboxylic acid or a derivative thereof that includes a terephthalic acid or a derivative thereof, and a diol that includes isosorbide are polymerized so that an acid moiety derived from the dicarboxylic acid or the derivative thereof and a diol moiety derived from the diol are repeated,

• wherein the diol moiety derived from the isosorbide has a content of 0.5 to 20 mol % with respect to a total diol moiety derived from the diol, and
• when a standard solution in which isosorbide is dissolved in chloroform at a concentration of 150 μg/mL, and a resin solution obtained by dissolving a component extracted from 0.5 g of the polyester resin in 5 mL of chloroform using a solvent in which cyclohexane and isopropyl alcohol are mixed at a volume ratio of 2.5:97.5, are analyzed by gas chromatography, respectively, a peak area ratio of a peak of the resin solution confirmed at the same retention time to a peak confirmed in the analysis of the standard solution (peak area of the resin solution/peak area of the standard solution) is 1.0 or less.