| 摘要 |
A lid member (10) is formed in a cup-like shape while having a plate portion (10a) and a cylindrical fixed portion (10b) axially protruding from an outer peripheral end of the plate portion (10a). An outer peripheral surface (10b1) of the fixed portion (10b), which serves as a fixation surface (B), is fixed to an inner peripheral surface (7a) of a housing (7) as an outer member (A). An axial dimension of the fixation surface (B) is larger than a thickness of the plate portion (10a), and hence it is possible to thinly-form the plate portion (10a) and to increase a fixing force between the lid member (10) and the housing (7). As a result, an axial dimension of a fluid dynamic bearing device can be reduced and durability thereof can be simultaneously increased.
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