To provide a fluid bearing device for a rotary apparatus endurable against high rotation with a simple structure.

This fluid bearing device includes a shaft hole member 1 having a bearing surface 1a of a predetermined width in the axial direction on an inner peripheral surface for partitioning a shaft hole, a shaft member 2 having a shaft surface 2a opposed to the bearing surface rotatably held by the shaft hole and a fluid supply means for supplying fluid between the bearing surface and the shaft surface. Both the bearing surface and the shaft surface are a side peripheral surface shape of a truncated cone shape, and the fluid supply means supplies the fluid in the axial direction between the bearing surface and the shaft surface. The bearing surface and the shaft surface are the side peripheral surface shape of the truncated cone shape, and since the fluid is supplied in the axial direction in these clearances, the shaft member 2 is energized to the axis of the shaft hole member 1, and can receive a load in the radial direction and a load in the axial direction by one mechanism, and a structurally simple rotary apparatus can be realized. The shaft member 2 has a turbine 8 on the axis, and rotates by a jet from a nozzle 6 of the shaft hole member 1.