A hydrostatic bearing apparatus has a hydrostatic bearing pad, a labyrinth seal part having an exhaust groove provided around the outside of the hydrostatic bearing pad, an adjustment mechanism for adjusting a labyrinth seal part gap, non-contacting displacement gauges for sensing changes in the size of the gap, and actuators that are activated to adjust the gap so as to maintain the gap at a predetermined constant value. The exhaust groove parts and the labyrinth seal part can move relative to each other, and an annular seal forms an airtight seal to prevent air leaks and keep the bearing steady.