To largely relieve a setting condition of parallelism of a pair of guide shafts more than usual in a direct acting guide mechanism for guiding a moving body by the two guide shafts parallelly inserted into the moving body.

In a direct acting guide mechanism by arranging an annular hydrostatic bearing in a bearing space formed between a moving body and guide shafts by parallelly inserting two guide shafts into the moving body, the hydrostatic bearing is arranged in the bearing space without restricting the radial direction, and fluid outflow holes are formed on the guide shaft side and the moving body side of the hydrostatic bearing.