That is, a method of manufacturing an optical element for solving the above problems includes forming a film on an optical substrate by using a coating liquid containing a metal alkoxide containing at least aluminum, immersing the film in {HEAD ~ a water} containing {TAIL ~ liquid}, baking 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 an irregularity structure 
That is , a method of manufacturing an optical element for solving the above problems includes forming a film on an optical substrate by using a coating liquid containing a metal alkoxide containing at least aluminum , immersing the film in { HEAD ~ a water } containing { TAIL ~ liquid } , baking 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 an irregularity structure
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