Patent ID: 8687316

Claim:
A spindle motor comprising: a base member; a bearing mechanism fixed to the base member; and a rotating portion rotatably supported by the bearing mechanism; wherein the base member includes a cup portion including: a cylindrical portion arranged to be concentric or substantially concentric with a central axis extending in a vertical direction; and a bottom plate portion defined integrally with the cylindrical portion, and arranged to close a bottom portion of the cylindrical portion; the bearing mechanism is accommodated in the cup portion; an adhesive is arranged between an outer circumferential surface of the bearing mechanism and an inner circumferential surface of the cylindrical portion; at least one of the outer circumferential surface of the bearing mechanism and the inner circumferential surface of the cylindrical portion includes an axially extending vertical groove; and a communicating hole which is not filled with the adhesive is arranged in at least a portion of an inside of the vertical groove, the communicating hole extending continuously from an upper end portion to a lower end portion of the vertical groove.