A laminated body having at least three or more different layers, wherein the laminate body is characterized by satisfying the following requirements to: the laminate body has a heat-sealing layer as at least one of the outermost layers, wherein the heat-sealing layer includes a polyester-based component containing ethylene terephthalate as a main constituent component, and when sealing is performed by bonding the heat-sealing layer together at 140°C and 0.2 MPa for 2 seconds, the laminate body provides a sealing strength of 8 N/15 mm or more and 30 N/15 mm or less; at least one layer other than the heat-sealing layer is an inorganic thin film layer; the laminate body has a water vapor permeation rate of 0.1 g/m 2 ·d or more and 6 g/m 2 ·d or less under an atmosphere at a temperature of 40°C and a relative humidity of 90% RH; the laminate body has an oxygen permeation rate of 5 ml/m 2 ·d·MPa or more and 30 ml/m 2 ·d·MPa or less under an atmosphere at a temperature of 23°C and a relative humidity of 65% RH; and the laminate body has a heat shrinkage rate, after immersion in hot water at 98°C for 3 minutes, of -5% or more and 5% or less in each of the longitudinal direction and the width direction, wherein the laminated body comprises a heat-resistant layer in addition to the heat-sealing layer and the inorganic thin film layer, wherein the heat-resistant layer includes a polyester-based component containing ethylene terephthalate as a main constituent component, and the layer containing the largest amount of the ethylene terephthalate component constitutes the heat resistant layer, and wherein the difference in content of monomer components other than ethylene terephthalate between the heat-sealing layer and the heat resistant layer is 20% by mole or more and 35% by mole or less. the laminate body has a heat-sealing layer as at least one of the outermost layers, wherein the heat-sealing layer includes a polyester-based component containing ethylene terephthalate as a main constituent component, and when sealing is performed by bonding the heat-sealing layer together at 140°C and 0.2 MPa for 2 seconds, the laminate body provides a sealing strength of 8 N/15 mm or more and 30 N/15 mm or less; at least one layer other than the heat-sealing layer is an inorganic thin film layer; the laminate body has a water vapor permeation rate of 0.1 g/m 2 ·d or more and 6 g/m 2 ·d or less under an atmosphere at a temperature of 40°C and a relative humidity of 90% RH; the laminate body has an oxygen permeation rate of 5 ml/m 2 ·d·MPa or more and 30 ml/m 2 ·d·MPa or less under an atmosphere at a temperature of 23°C and a relative humidity of 65% RH; and the laminate body has a heat shrinkage rate, after immersion in hot water at 98°C for 3 minutes, of -5% or more and 5% or less in each of the longitudinal direction and the width direction, wherein the laminated body comprises a heat-resistant layer in addition to the heat-sealing layer and the inorganic thin film layer, wherein the heat-resistant layer includes a polyester-based component containing ethylene terephthalate as a main constituent component, and the layer containing the largest amount of the ethylene terephthalate component constitutes the heat resistant layer, and wherein the difference in content of monomer components other than ethylene terephthalate between the heat-sealing layer and the heat resistant layer is 20% by mole or more and 35% by mole or less.