To provide a hydrodynamic bearing and a motor using the hydrodynamic bearing capable of generating no wear in spite of surface contact and achieving a miniaturization and saving electric energy and further having high reliability by solving a static electricity problem based on secured electric conductivity, when receiving an external disturbance during start-stop operation, regular speed operation, and acceleration and deceleration operation.

The hydrodynamic bearing unit provides a shaft 3 and sleeve 12 relatively arranged in a rotation-free state via a radial bearing and thrust bearing. DLC 16 having electric conductivity is entirely or partially coated on at least one of opposing faces forming the radial bearing or thrust bearing. Normal DLC 17 is entirely or partially coated on at least one of opposing faces forming the radial bearing or thrust bearing.