| 摘要 |
An etalon device comprises a pair of parallel plates each of which is arranged to be faced each other, a pair of holder portions which hold individually a pair of the parallel plates respectively, and a housing portion arranged at the outside of the pair of the holder portions, wherein at least one of the pair of the holder portions has a concave portions in its inner peripheral surface, which the parallel plate corresponding to it touches, and an inclined surface is arranged at, at least either the concave portions or the parallel plates. The inclined surface is formed on the outer peripheral portion of the parallel plate. Thereby, the etalon device having simple constitution which can be assembled by adjusting the parallelism of the surfaces of the corresponding parallel plates, and manufacturing method of it can be provided.
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