A composite filter includes: a filter unit including a filter member for filtering air, the filter member having a plurality of filtering parts with side surfaces connected to each other so that the filtering parts are rotatable with respect to each other; at least one filter module arranged in parallel with at least one of the plurality of filtering parts; and a bracket supporting the filtering parts disposed adjacent to each other among the plurality of filtering parts and the filter module together so that the filtering parts disposed adjacent to each other are rotatable with respect to each other. The bracket includes: a folded portion that is selectively folded according to the relative rotation of the filtering parts disposed adjacent to each other; and a plurality of attachment portions respectively connected to the folded portion with the folded portion interposed therebetween, and respectively attached to the side surfaces of the filtering parts disposed adjacent to each other. The folded portion and the attachment portions are provided integrally with each other and are formed of a flexible material, and each of the attachment portions extends to the side surface of the filter module adjacent thereto to seal a gap between the filtering part and the filter module.