A vacuum heat-insulating container comprising: an outer cylinder having a bottom, and an inner cylinder having a bottom and disposed inside the outer cylinder , wherein a vacuum space is formed between the outer cylinder and the inner cylinder , the inner cylinder and the outer cylinder are disposed such that an opening plane of the inner cylinder is located outward of an opening plane of the outer cylinder , the outer cylinder has a first annular wall that extends inwardly along the opening plane of the outer cylinder , and that includes a leading end portion , the inner cylinder has a second annular wall that extends toward an outside of the inner cylinder along the opening plane of the inner cylinder , and that faces the first annular wall , the vacuum heat-insulating container includes an annular sealing member that is made of an elastic body having a coefficient of heat transfer lower than a coefficient of heat transfer of the outer cylinder and a coefficient of heat transfer of the inner cylinder , and that is squeezed between the first annular wall and the second annular wall so as to seal the vacuum space ; wherein the leading edge portion is disposed at a distance from an outer circumferential surface of the inner cylinder , characterised in that the outer cylinder is disposed such that the opening plane of the outer cylinder is oriented along a vertical direction, a restraining member that restrains the outer circumferential surface of the inner cylinder from moving toward an inner circumferential surface of the outer cylinder is disposed at a vertically lower side of the vacuum space , and the restraining member is made of a material having a coefficient of heat transfer lower than the coefficient of heat transfer of the outer cylinder and the coefficient of heat transfer of the inner cylinder ; and a surface of the restraining member facing the inner cylinder has a low-friction part in which a frictional force is smaller than a frictional force in the other part. an outer cylinder having a bottom, and an inner cylinder having a bottom and disposed inside the outer cylinder , wherein a vacuum space is formed between the outer cylinder and the inner cylinder , the inner cylinder and the outer cylinder are disposed such that an opening plane of the inner cylinder is located outward of an opening plane of the outer cylinder , the outer cylinder has a first annular wall that extends inwardly along the opening plane of the outer cylinder , and that includes a leading end portion , the inner cylinder has a second annular wall that extends toward an outside of the inner cylinder along the opening plane of the inner cylinder , and that faces the first annular wall , the vacuum heat-insulating container includes an annular sealing member that is made of an elastic body having a coefficient of heat transfer lower than a coefficient of heat transfer of the outer cylinder and a coefficient of heat transfer of the inner cylinder , and that is squeezed between the first annular wall and the second annular wall so as to seal the vacuum space ; wherein the leading edge portion is disposed at a distance from an outer circumferential surface of the inner cylinder , characterised in that the outer cylinder is disposed such that the opening plane of the outer cylinder is oriented along a vertical direction, a restraining member that restrains the outer circumferential surface of the inner cylinder from moving toward an inner circumferential surface of the outer cylinder is disposed at a vertically lower side of the vacuum space , and the restraining member is made of a material having a coefficient of heat transfer lower than the coefficient of heat transfer of the outer cylinder and the coefficient of heat transfer of the inner cylinder ; and a surface of the restraining member facing the inner cylinder has a low-friction part in which a frictional force is smaller than a frictional force in the other part. <EOS>