| 摘要 |
There is provided an optical element which can achieve more reduction in the number of components, downsizing, low cost, and an improvement in the mass-productivity while maintaining an excellent optical property. The optical element comprises: an optical block having a cavity part formed on an optical path and an inclined face formed in an internal face of the cavity part at a prescribed inclining angle with respect to a traveling direction of light, wherein multilayer films of the same structure are formed at least on the internal face of the cavity part and on an interface between light incident end and/or emission end of the optical block and outside. The multilayer film formed on the inclined face in the internal face of the cavity part has at least a wavelength selecting function for light to be used, and the multilayer film formed on other face than the inclined face has an antireflective function for light to be used.
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