A vacuum adiabatic body comprising: a first plate defining at least one portion of a first side of a wall adjacent to a first space having a first temperature; a second plate defining at least one portion of a second side of the wall adjacent to a second space having a second temperature different from the first temperature; a seal that seals the first plate and the second plate to provide a third space that has a third temperature between the first temperature and the second temperature and is in a vacuum state; a support that supports the first and second plates (10, 20) and is provided in the third space; and an exhaust port through which a gas in the third space is exhausted, wherein the support includes a plurality of bars interposed between the first and second plates (10, 20), the plurality of bars being provided in a grid shape having predetermined pitch, a plurality of adjacent bars among the plurality of bars constitutes a unit grid, and a surface of each of the first and second plates surrounding the unit grid, is defined as a unit grid area, wherein, within the unit grid area, a highest point is defined as a location of one of the plurality of bars and a lowest point is defined as a central portion of the unit grid area, furthest away from any one of the plurality of bars, wherein an angle formed by a straight line connecting the highest point and the lowest point to each other with respect to a plane formed by a plurality of highest points in the unit grid area is defined as a bending angle (θ), and wherein a plurality of unit grid areas are formed by the respective unit grid on the surface of each of the first and second plates (10, 20), characterized in that the bending angle of the plurality of unit grid areas is equal to or greater than 0.25 ∗ 10^(-3) rad and equal to or smaller than 1.0 ∗ 10^(-3) rad; and wherein, when a thickness of each of the first and second plates (10, 20) is T, and the predetermined pitch between the plurality of bars is P, an inequality of T>0.032×P is satisfied. a first plate defining at least one portion of a first side of a wall adjacent to a first space having a first temperature; a second plate defining at least one portion of a second side of the wall adjacent to a second space having a second temperature different from the first temperature; a seal that seals the first plate and the second plate to provide a third space that has a third temperature between the first temperature and the second temperature and is in a vacuum state; a support that supports the first and second plates (10, 20) and is provided in the third space; and an exhaust port through which a gas in the third space is exhausted, wherein the support includes a plurality of bars interposed between the first and second plates (10, 20), the plurality of bars being provided in a grid shape having predetermined pitch, a plurality of adjacent bars among the plurality of bars constitutes a unit grid, and a surface of each of the first and second plates surrounding the unit grid, is defined as a unit grid area, wherein, within the unit grid area, a highest point is defined as a location of one of the plurality of bars and a lowest point is defined as a central portion of the unit grid area, furthest away from any one of the plurality of bars, wherein an angle formed by a straight line connecting the highest point and the lowest point to each other with respect to a plane formed by a plurality of highest points in the unit grid area is defined as a bending angle (θ), and wherein a plurality of unit grid areas are formed by the respective unit grid on the surface of each of the first and second plates (10, 20), characterized in that the bending angle of the plurality of unit grid areas is equal to or greater than 0.25 ∗ 10^(-3) rad and equal to or smaller than 1.0 ∗ 10^(-3) rad; and wherein, when a thickness of each of the first and second plates (10, 20) is T, and the predetermined pitch between the plurality of bars is P, an inequality of T>0.032×P is satisfied.