| 摘要 |
A magnetic piece 23 is provided in the almost central portion of a magnet 18 in a tracking direction. Therefore, the magnetic piece 23 is attracted to the almost central portion of the magnet 18 by the magnetic attraction of the magnet 18 and is held therein. In addition, when a lens holder 15 is set in a neutral position in a focusing direction, the magnetic pieces 23 are provided in the vicinity of both edge portions in the focusing direction of the magnet 18, respectively. Consequently, the lens holder 15 is held in the balance position of the magnetic attractions for both magnetic pieces 23.
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