Patent ID: 8879200

Claim:
A spindle motor for use in a disk drive apparatus to drive a disk, the disk drive apparatus including a housing defining an interior space, the spindle motor comprising: a stationary portion including a shaft arranged to extend in an axial direction; a base portion arranged to define a portion of the housing, and including a through hole in which the shaft is inserted, the through hole having an asymmetrical radial cross-section; and a rotating portion arranged to rotate about a central axis with respect to the stationary portion; wherein the base portion includes an inner circumferential portion arranged to define the through hole, the inner circumferential portion and a lower portion of the shaft defining a fixing region therebetween; the fixing region includes a press-fitting region and an adhesion region defined on a lower side of the press-fitting region and in which a seal gap is defined between the inner circumferential portion of the base portion and the lower portion of the shaft; one of the lower portion of the shaft and a portion of a lower end portion of an inner circumferential surface of the inner circumferential portion includes a recessed portion arranged to be in connection with the seal gap; and the seal gap and a space in the through hole abutting on the recessed portion are arranged to include an adhesive arranged continuously therein, with the adhesive being arranged over an entire circumference of the seal gap.