The composite gel of one aspect of the present disclosure is constructed by gelling a raw material composition including a hydroxyl group-containing organic polymer and a hydroxyl group-containing inorganic compound and/or an inorganic oxide as the main components. The method for producing a composite gel of one aspect of the present disclosure includes a first step for gelling a raw material composition including a hydroxyl group-containing organic polymer and a hydroxyl group-containing inorganic compound and/or an inorganic oxide as the main components and a second step for obtaining a fine powder of a composite gel by pulverizing after drying the product obtained in the first step.