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