Heat-shrinkable polyester film, heat-shrinkable label, and package product

A heat-shrinkable polyester film, comprising,

• 95 mol % or more and 100 mol % or less of dicarboxylic acid, and 0 mol % or more and 5 mol % or less of isophthalic acid in 100 mol % of whole dicarboxylic acid component,
• 85 mol % or more and 98 mol % or less of ethylene terephthalate unit in 100 mol % of whole ester unit, and
• 2 mol % or more and 15 mol % or less of diethylene glycol in 100 mol % of whole polyol component,
• and satisfying the requirements (1) to (5):
• (1) a hot-water heat shrinkage ratio in a width direction of the film is 40% or more and 70% or less by immersing the film in a hot water at 90° C. for 10 seconds,
• (2) a hot-water heat shrinkage ratio in a longitudinal direction of the film is-5% or more and 15% or less by immersing the film in a hot water at 90° C. for 10 seconds,
• (3) an endothermic peak temperature in melting is 245° C. or higher and 260° C. or lower through differential scanning calorimetry (DSC) in heating the film to 300° C. to be melted, quenching the film, and then re-heating the film to 300° C.,
• (4) an amount of exothermic heat in crystallizing is 10 mJ/mg or more through differential scanning calorimetry (DSC) in heating the film to 300° C. to be melted, quenching the film, and then re-heating the film to 300° C., and
• (5) an amount of endothermic heat in melting is 10 mJ/mg or more through differential scanning calorimetry (DSC) in heating the film to 300° C. to be melted, quenching the film, and then re-heating the film to 300° C.