A laminated metal sheet comprising: a metal sheet; a first polyester resin layer formed on a surface of the metal sheet to serve as an exterior of a container after being formed into the container; and a second polyester resin layer formed on another surface of the metal sheet to serve as an interior of the container after being formed into the container, wherein the first polyester resin layer contains not less than 30% by mass and not more than 60% by mass of copolymerized polyethylene terephthalate having a copolymerization component content of less than 6 mol%, and not less than 40% by mass and not more than 70% by mass of polybutylene terephthalate, the second polyester resin layer is a copolymerized polyethylene terephthalate having a copolymerization component content of less than 14 mol%, and the first and the second polyester resin layers have a degree of residual orientation in a range of not less than 2% and not more than 50%, and have thicknesses after lamination of not less than 6 μm wherein the degree of residual orientation is determined according to the following method: for an oriented polyester resin (or an oriented polyester film) before lamination and the resin (or film) after lamination, the X-ray diffraction intensity is measured in a range of 2θ = 20 to 30°; the straight line between X-ray diffraction intensities at 2θ = 20° and at 2θ = 30° is set as a base line; the height of the highest peak observed in the neighborhood of 2θ = 22 to 28° is measured with reference to the base line; the degree of residual orientation (%) is represented by P2/P1 × 100, where P1 is the height of the highest peak of the film before lamination, and P2 is the highest peak of the film after lamination. a metal sheet; a first polyester resin layer formed on a surface of the metal sheet to serve as an exterior of a container after being formed into the container; and a second polyester resin layer formed on another surface of the metal sheet to serve as an interior of the container after being formed into the container, wherein the first polyester resin layer contains not less than 30% by mass and not more than 60% by mass of copolymerized polyethylene terephthalate having a copolymerization component content of less than 6 mol%, and not less than 40% by mass and not more than 70% by mass of polybutylene terephthalate, the second polyester resin layer is a copolymerized polyethylene terephthalate having a copolymerization component content of less than 14 mol%, and the first and the second polyester resin layers have a degree of residual orientation in a range of not less than 2% and not more than 50%, and have thicknesses after lamination of not less than 6 μm wherein the degree of residual orientation is determined according to the following method: for an oriented polyester resin (or an oriented polyester film) before lamination and the resin (or film) after lamination, the X-ray diffraction intensity is measured in a range of 2θ = 20 to 30°; the straight line between X-ray diffraction intensities at 2θ = 20° and at 2θ = 30° is set as a base line; the height of the highest peak observed in the neighborhood of 2θ = 22 to 28° is measured with reference to the base line; the degree of residual orientation (%) is represented by P2/P1 × 100, where P1 is the height of the highest peak of the film before lamination, and P2 is the highest peak of the film after lamination. for an oriented polyester resin (or an oriented polyester film) before lamination and the resin (or film) after lamination, the X-ray diffraction intensity is measured in a range of 2θ = 20 to 30°; the straight line between X-ray diffraction intensities at 2θ = 20° and at 2θ = 30° is set as a base line; the height of the highest peak observed in the neighborhood of 2θ = 22 to 28° is measured with reference to the base line; the degree of residual orientation (%) is represented by P2/P1 × 100, where P1 is the height of the highest peak of the film before lamination, and P2 is the highest peak of the film after lamination.