To achieve and provide a hemispherical fluid and gas dynamic pressure bearing motor that is suited for thinning and reduction in current, has a simple structure, and can reduce costs, by solving the problems of realization of stability in a rotary attitude, a structure that can be assembled easily, an the like that are the problems in the hemispherical fluid and gas dynamic pressure bearing motor.

The motor comprises a shaft where at least one side is hemispherical, a sleeve having a recess that opposes the shaft, lubrication fluid in the gap between the shaft and the sleeve, and a magnetic means that has either a magnet or a magnetic body in the shaft or on the bottom surface of the sleeve and generates magnetic attraction force between a shaft end and a sleeve bottom surface. The motor has a dynamic pressure groove on the hemispherical bearing surface of the shaft or the sleeve, and balances the axial component force in load capacitance that the dynamic pressure groove generates in rotation and the magnetic attraction force for supporting the rotary section, inhibits NRRO for thinning, reduces current, and reduces costs.