Heat-shrinkable polyester-based film, heat-shrinkable label, and packaging body

A heat-shrinkable polyester-based film comprising:

• the heat-shrinkable polyester-based film contains
• 60 mol % or more and 95 mol % or less of ethylene terephthalate units in 100 mol % of all ester units,
• 5 mol % or more and 40 mol % or less of diethylene glycol in 100 mol % of the polyhydric alcohol component, and
• 0 mol % or more and 5 mol % or less of constituent units derived from a monomer component that can be an amorphous component in all polyester resin components, wherein the monomer component that can be an amorphous component is neopentyl glycol, 1,4-cyclohexanedimethanol, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,2-diethyl-1,3-propanediol, 2-n-butyl-2-ethyl-1,3-propanediol, 2,2-isopropyl-1,3-propanediol, 2,2-di-n-butyl-1,3-propanediol, or hexanediol, and
• the heat-shrinkable polyester-based film satisfies the following requirements (1) to (5):
• (1) a hot water heat shrinkage ratio in the film width direction is 40% or more and 80% or less when the film is immersed in hot water at 90° C. for 10 seconds;
• (2) a hot water heat shrinkage ratio in the film longitudinal direction is −5% or more and 15% or less when the film is immersed in hot water at 90° C. for 10 seconds;
• (3) a puncture strength of the film is 0.2 N/μm or more and 0.6 N/μm or less as measured according to JIS Z1707;
• (4) a density of the film is 1.330 g/cm3 or more and 1.385 g/cm3 or less;
• and
• (5) the refractive index in the film longitudinal direction is 1.575 or less.