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 the film having been immersed in {HEAD ~ the water} containing liquid, and subjecting the film having been baked to treatment with warm water to form an aluminum containing film having {TAIL ~ a fine irregularity structure} 
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 the film having been immersed in { HEAD ~ the water } containing liquid , and subjecting the film having been baked to treatment with warm water to form an aluminum containing film having { TAIL ~ a fine irregularity structure }
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