To provide a fluid bearing device capable of instantly reducing power consumption when an acting external force decreases.

In an axial direction of a rotation shaft 6, at least two regular fluid bearings 3, 5 and at least one auxiliary fluid bearing 4 are provided. A gas supply channel communicating with a recess 42 of the auxiliary fluid bearing 4 is provided with a solenoid valve 16, and a liquid supply channel communicating with the recess 42 is provided with a solenoid valve 12. While an external force acting on the rotation shaft 6 is small, the solenoid valve 12 is closed to stop liquid supply to the auxiliary fluid bearing 4, and then the solenoid valve 16 is opened to supply gas to the recess 42 of the auxiliary fluid bearing 4.