{HEAD ~ The method} includes forming a film on the optical substrate by using a coating liquid containing a metal alkoxide containing at least aluminum, immersing the film in a water containing liquid, baking {TAIL ~ the film} having been immersed in the water containing liquid, and subjecting the film having been baked to treatment with warm water to form an aluminum containing film having a fine irregularity structure 
includes baking
{ HEAD ~ The method } includes forming a film on the optical substrate by using a coating liquid containing a metal alkoxide containing at least aluminum , immersing the film in a water containing liquid , baking { TAIL ~ the film } having been immersed in the water containing liquid , and subjecting the film having been baked to treatment with warm water to form an aluminum containing film having a fine irregularity structure
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