Heat-shrinkable polyester film and package

The present invention provides a method of suppressing the performance deterioration of aging reduced shrinkage finish property, and used as a label after heat-shrinkable polyester film relaxation does not occur. The heat-shrinkable polyester film comprising a polyester predetermined composition, and satisfy the following conditions: The absorbance at A1 1340cm-1 at the (1) of the film measured by ATR-FTIR method and polarization in 1410cm-1 absorbance ratio A2 A1 / A2 in the film width direction, the longitudinal direction are 0.45 or more and 0.75 or less is 0.40 or more and less than 0.45; 30 (2) so that the heat-shrinkable film at 90 deg.] C hot air for 30 seconds the ratio of shrinkage stress (shrinkage stress after 30 seconds) after the second and the maximum shrinkage stress (shrinkage stress after 30 seconds / the maximum shrinkage stress) of 75% or more and 100% or less; (3) at 30 ℃, 85% RH atmosphere after 672 hours of aging of the film, the film was aged at 70 ℃ hot water in the hot-water heat shrinkage in the width direction when immersed in 10 seconds 30% or more and 55% or less.