| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that the shape of a bottom board becomes complicated or large although the holding part of a guide member for a movable optical element can be easily formed on the bottom board. SOLUTION: Relating to this optical device equipped with the movable optical elements 2 and 3 capable of moving in an optical axis direction with respect to the bottom board 10, at least either the guide member 8 guiding the movable optical element in the optical axis direction or a shake preventing member 9 preventing the shake of the movable optical element around the member 8 is held by a mask member 7 formed separately from the bottom board and fixed on the bottom board, and removing the harmful light of the optical system.
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