Polyester resin

The polyester resin contains a polymer of (A) an acid component and (B) an alcohol component. Component (A) contains 80 mol% or more of a 2, 6-naphthalenedicarboxylic acid component relative to the total amount of component (A). Component (B) contains at least two substances selected from the group consisting of 1, 4-butanediol, 1, 4-cyclohexanedimethanol, and ethylene glycol. The amount of at least one of the components (B) is 80 mol% or more with respect to the total amount of the components (B). 聚酯树脂包含(A)酸成分与(B)醇成分的聚合物。(A)成分含有相对于(A)成分的总量为80mol％以上的2,6-萘二羧酸成分。(B)成分含有选自由1,4-丁二醇、1,4-环己烷二甲醇、及乙二醇组成的组中的至少2种。(B)成分中的至少1种相对于(B)成分的总量为80mol％以上。