| 摘要 |
An object of the present invention is to provide a diffractive optical element that can simultaneously realize a plurality of optical functions and that is small in size and excellent in productivity, a producing method thereof, and an optical apparatus. Thus, a diffractive optical element 10 has a multilayer member 10a composed of a plurality of layers 11 to 13 each of which is made of an optical material. Adjacent layers (11 and 12) and (12 and 13) of the multilayer member are in contact with each other, and have different refractive indexes from each other. The multilayer member includes boundary faces 10b and 10c between the contacted adjacent layers. Uneven patterns 14 and 1 5 that cause transmitted light to undergo desired diffraction are formed on at least two faces of three faces including the boundary faces and outer surfaces of the multilayer member. The uneven patterns formed on different faces have different shapes or sizes in the direction of layers of the multilayer member. <IMAGE>
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