A hydrodynamic type oil-impregnated sintered bearing includes a porous bearing body of sintered metal having a bearing surface in which hydrodynamic pressure generating grooves slating against an axial direction are provided. The device includes a base that contains an air flow generator having an inlet and an outlet. A resilient member is coupled to a wall of the retainer and projects into the passageway for controllably impeding movement through the passageway.