Heat-shrinkable polyester film

A heat-shrinkable polyester film derived from a mixture of multiple amorphous polyester resins that are reaction products of a polyvalent carboxylic acid and polyalcohols as a mixed resin,

• wherein the mixed resin includes a first polyester resin made of a first polyalcohol having an alicyclic structure and a second polyester resin made of a second polyalcohol not having an alicyclic structure,
• the first polyalcohol contains 1,4-cyclohexanedimethanol, ethylene glycol and diethylene glycol, and when the total amount of the first polyalcohol is 100 mol %, the amount of 1,4-cyclohexanedimethanol is 20 to 35 mol %, the amount of ethylene glycol is 50 to 65 mol %, and the amount of diethylene glycol is 5 to 20 mol %,
• the second polyalcohol contains 2-methyl-1,3-propanediol, ethylene glycol and diethylene glycol, and when the total amount of the second polyalcohol is 100 mol %, the amount of 2-methyl-1,3-propanediol is 20 to 30 mol %, the amount of ethylene glycol is 50 to 65 mol %, and the amount of diethylene glycol is 5 to 20 mol %,
• the blending ratio of the first polyester resin and the second polyester resin is within the range of 20/80 to 80/20 by weight basis,
• the thermal shrink stress at 85° C. is below 6.8 MPa, and
• the thermal shrinkage ratio in the main shrinkage direction at 70° C. is within the range of 25-40%, and the thermal shrinkage ratio in the main shrinkage direction at 85° C. is within the range of 55-75%.