Abstract: A novel porous honeycomb structure highly functionalized as compared with the conventional example, manufacturing method thereof and an air cleaner using the structure are provided. The functionalized porous honeycomb structure is a silica gel form, and fine powder for adding the function is dispersed in the form. Further the method of manufacturing in accordance with the present invention includes the steps of (a) preparing silica sol by mixing ion exchange resin in sodium silicate aqueous solution; (b) removing said ion exchange resin and adjusting pH; (c) dispersing fine powder for adding a function to the silica sol; (d) gelating the silica sol to provide silica wet gel; and (e) freezing the silica wet gel.