Patent ID: 8243383

Claim:
A disk drive device comprising: a tubular sleeve that supports a shaft; a tubular housing member that is arranged so as to surround the sleeve and make the end of the sleeve protrude; a base member that holds the housing member and fixes a stator core so as to surround the housing member; a hub that drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member; and a tubular thrust member that is rotated integrally with the hub, wherein the sleeve has a flange extending in the outer diameter direction at the hub side edge, and forms a first annular area between the flange and the hub side edge of the housing member, wherein the base member forms a second annular area on the outer circumference side of the housing member, and wherein the thrust member has a ring portion that surrounds the sleeve and a descender portion that surrounds the housing member, where the ring portion is fixed, with an adhesive, to the interior wall of a hub side tubular wall formed in the hub, and is rotated in the first area, and where the descender portion is joined to the outer edge portion of the ring portion and fixed, with an adhesive, to the interior wall of the hub side tubular wall, and is rotated in the second area, wherein a lubricant is filled between the housing member and the thrust member, and also between the flange of the sleeve and the hub, and wherein a protrusion extending in the outer diameter direction is formed at the base side edge of the descender portion of the thrust member.