Method of Manufacturing Porous Bearing Component, and Method of Manufacturing Fluid Dynamic-Pressure Bearing Furnished with the Porous Bearing Component

Manufacturing method for impregnating with lubricant a porous bearing material retained in a bearing retaining cavity in a bearing retainer. Under a reduced-pressure space within a vacuum chamber, a bearing structural unit in which a porous bearing material is retained in a bearing retaining cavity in a bearing retainer is, with an opening in the bearing structural unit directed down, immersed in or contacted on lubricant to cover over the bearing-structural-unit opening; by then restoring chamber pressure, the porous bearing material is impregnated with the lubricant. The manufacturing method controls to a minimum adhesion of lubricant to the bearing-retainer exterior, to eliminate as far as possible the trouble of lubricant cleanup, and at the same time makes the impregnation of the porous bearing material with lubricant more sound and facilitates the impregnation job despite its being under a reduced-pressure atmosphere.