Patent ID: 7941926

Claim:
An apparatus for manufacturing a hydro dynamic bearing device including a housing, an axial member housed in the housing, a radial bearing part for supporting the axial member in a non-contact manner in a radial direction by a hydro dynamic pressure action of a lubricating oil generated in a radial bearing clearance, and a sealing part formed on one end part of the housing, the apparatus comprising: a laser displacement determining means for measuring an oil-level height of the lubricating oil in the housing, arranged at a position a predetermined distance away from the sealing part of the housing, wherein a first distance from a standard position of the laser displacement determining means to the sealing part and a second distance from the standard position of the laser displacement determining means to the oil-level height are detected, and the oil-level of the lubricating oil in the housing is detected based on a comparison result between the first distance and the second distance.