A vacuum adiabatic body includes a first plate; a second plate; a seal; a support; a heat resistance unit; and an exhaust port, wherein the heat resistance unit includes a conductive resistance sheet having one end connected to the first plate member, the conductive resistance sheet resisting heat conduction flowing along a wall for the third space, the heat resistance unit further includes a side frame connected to the conductive resistance sheet, the side frame defining at least one portion of the wall for the third space, the side frame includes a first mounting surface connected to the conductive resistance sheet and a second mounting surface connected to the second plate, and the second mounting surface is supported by the support.