a hydrostatic support structure wherein , to move a surface with a load disposed thereupon with respect to a bearing surface , a liquid cushion is provided due to a feeding of a liquid into an inner space defined by the bearing surface and a housing having a sealing member . within the housing there is disposed a piston provided with its own sealing member which seals the gap between the housing and the piston , whereas the first sealing member defining the liquid cushion being formed along the perimeter of the inner space is rigidly secured to the housing of the support structure .