| 摘要 |
PURPOSE: A spindle motor and a disk driver including the same are provided to strongly combine a rotating member and arrange a filling groove, thereby securing assembly and rotation stability of the spindle motor. CONSTITUTION: A bush(30) rotates together with a shaft(10). A rotor case(41) comprises a cylindrical wall part(41a) combined with the outer circumferential surface of the bush. A chucking part(60) detachably combines a disk. A filling groove(35) is arranged on a boundary part of the shaft and the bush. A third ring shape groove part is arranged on the inner circumferential surface of the bush in an axial direction.
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