A heat-shrinkable polyester film having a main shrinkage direction in a longitudinal direction of the film, wherein the film has 50 mol% or more of terephthalic acid in 100 mol% of dicarboxylic acid constituting the polyester film; the film has 40 mol% or more of ethylene glycol in 100 mol% of polyhydric alcohol constituents; the film has butanediol constituent of 8 mol% or more and 40 mol% or less in a whole glycol constituent of the polyester constituting the film; the film has 10 mol% or more to 40 mol% or less of one or more monomer components that may be an amorphous component in 100 mol% of polyhydric alcohol or 100 mol% of polycarboxylic acid in all polyester resin; and the film has a thickness of 6 μm or more and 30 μm or less; and wherein the film further satisfies the following requirements to: the film has a shrinkage of 35% or more and 70% or less in the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a shrinkage of -8% or more and 7% or less in a width direction orthogonal to the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a change rate of 5% or more and 22% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with fixed-length in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a change rate of 5% or more and 20% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with 10% of slack in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a maximum shrinkage stress of 2 MPa or more and 10 MPa or less in the longitudinal direction measured under hot air of 90°C. the film has a stress at 10% elongation of 1 MPa or more and 5 MPa or less in the longitudinal direction and 0.5 MPa or more and 3 MPa or less in the width direction when measured under hot air of 90°C. the film has 50 mol% or more of terephthalic acid in 100 mol% of dicarboxylic acid constituting the polyester film; the film has 40 mol% or more of ethylene glycol in 100 mol% of polyhydric alcohol constituents; the film has butanediol constituent of 8 mol% or more and 40 mol% or less in a whole glycol constituent of the polyester constituting the film; the film has 10 mol% or more to 40 mol% or less of one or more monomer components that may be an amorphous component in 100 mol% of polyhydric alcohol or 100 mol% of polycarboxylic acid in all polyester resin; and the film has a thickness of 6 μm or more and 30 μm or less; and wherein the film further satisfies the following requirements to: the film has a shrinkage of 35% or more and 70% or less in the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a shrinkage of -8% or more and 7% or less in a width direction orthogonal to the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a change rate of 5% or more and 22% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with fixed-length in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a change rate of 5% or more and 20% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with 10% of slack in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a maximum shrinkage stress of 2 MPa or more and 10 MPa or less in the longitudinal direction measured under hot air of 90°C. the film has a stress at 10% elongation of 1 MPa or more and 5 MPa or less in the longitudinal direction and 0.5 MPa or more and 3 MPa or less in the width direction when measured under hot air of 90°C. the film has a shrinkage of 35% or more and 70% or less in the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a shrinkage of -8% or more and 7% or less in a width direction orthogonal to the longitudinal direction after 10 seconds immersion in hot water of 80°C. the film has a change rate of 5% or more and 22% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with fixed-length in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a change rate of 5% or more and 20% or less in the width direction of the film, and the change rate is measured by fixing the film in the longitudinal direction with 10% of slack in the longitudinal direction and gripping the film in hot air of 90°C for 10 seconds. the film has a maximum shrinkage stress of 2 MPa or more and 10 MPa or less in the longitudinal direction measured under hot air of 90°C. the film has a stress at 10% elongation of 1 MPa or more and 5 MPa or less in the longitudinal direction and 0.5 MPa or more and 3 MPa or less in the width direction when measured under hot air of 90°C.