| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk driving device whose assembly work is easy and in which a hub does not come off from a yoke by cramping force. SOLUTION: In the disk driving device, the rotor 12 of a spindle motor which supports a disk 20 and rotates, consists of a hub 14 having a cylindrical outer peripheral face into which the center hole of the disk 20 is inserted, a cylindrical yoke 16 inserted into the hub 14 and a rotor magnet 18 fitted to the inner periphery of the yoke 16. A cramper 26 for pressing/holding the disk held by the hub 14 is fitted to the yoke 16. A fitting part 14b fitted to the yoke 16 from a direction same as a depression direction by the cramper 26 is formed in the hub 14.
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