Patent ID: 7972065

Claim:
A hydrodynamic bearing device, comprising: a sleeve having an insertion hole; a shaft disposed in said insertion hole of said sleeve so as to be capable of rotation relative to said sleeve, and having a main portion and a large diameter portion, said large diameter portion being disposed at an end of said main portion and having a diameter larger than a diameter of said main portion; a lubricating fluid held in a gap formed between said sleeve and said shaft; a bearing portion relatively rotatably supporting said sleeve and said shaft via said lubricating fluid; a flange cover fixed to said sleeve at a first end of said shaft in the axial direction of said shaft; a bubble suppression portion formed as a recess in at least one of said first end of said shaft and in said flange cover; and at least one first communicating portion communicating between said bubble suppression portion and a face of the large diameter portion that is not opposite the flange cover.