Optical member and its production method

A method for producing an optical member in which an antireflection coating including a transparent fine uneven pattern coating that contains alumina hydrate, as a main component, is provided in an optically effective area on a surface of a transparent substrate, and in which a light shield coating is provided in an area including at least a boundary part, which is next to the optically effective area, in a non-effective area next to the optically effective area, the method performing in the following order:

• a first light shield coating formation step that forms a first layer of the light shield coating only in a part of an area in which the light shield coating is to be formed;
• a step that deposits an optical thinfilm including, as its outermost layer, a layer to be hydrothermally treated, which will become the fine uneven pattern coating by being hydrothermally treated, in an area in which the antireflection coating is to be formed;
• a second light shield coating formation step that forms a second layer of the light shield coating at least in all parts of the area in which the light shield coating is to be formed, where the first layer is not formed;
• and
• a step that forms the fine uneven pattern coating in the area in which the antireflection coating is to be formed by hydrothermally treating the layer to be hydrothermally treated.