A laundry processing apparatus comprising: a processing module in which a receiving space receiving an object to be processed is open toward at least one side thereof so that circulating air processing the object is discharged; a guide duct configured to be adjacent to the processing module 200, and to guide the circulating air processing the object to a heat exchange module; a filter assembly detachably supported by a filter holder that is positioned between the processing module and the guide duct, and including an inner filter and an outer filter that are overlappingly assembled with each other to remove debris contained in the circulating air and then to supply the circulating air to the guide duct; and a sealing member provided to cover at least a part of an outer surface of the outer filter that is assembled with the filter holder to seal a gap between the outer filter and the filter holder, and a part of the sealing member being in contact with the inner filter to seal a gap between the inner filter and the outer filter, wherein the sealing member comprises a first sealing part that seals the gap between the outer filter and the filter holder and a second sealing part that seals the gap between the outer filter and the inner filter, wherein the sealing member comprises: a base extended along a lower surface of the seating end of the outer filter and coupled to the outer filter; the first sealing part protruding from one end of the base to an outside and extended in an inclined direction toward the filter holder; a connector extended from the base and covering an outside edge of the seating end; and the second sealing part protruding from an outer surface of the connector covering an upper surface of the seating end toward the inner filter, and characterized in that the second sealing part is positioned at a location retracted inward from the connector of the sealing member covering a lateral surface of the seating end of the outer filter toward a center of the filter mounting space accommodating the inner filter. a processing module in which a receiving space receiving an object to be processed is open toward at least one side thereof so that circulating air processing the object is discharged; a guide duct configured to be adjacent to the processing module 200, and to guide the circulating air processing the object to a heat exchange module; a filter assembly detachably supported by a filter holder that is positioned between the processing module and the guide duct, and including an inner filter and an outer filter that are overlappingly assembled with each other to remove debris contained in the circulating air and then to supply the circulating air to the guide duct; and a sealing member provided to cover at least a part of an outer surface of the outer filter that is assembled with the filter holder to seal a gap between the outer filter and the filter holder, and a part of the sealing member being in contact with the inner filter to seal a gap between the inner filter and the outer filter, wherein the sealing member comprises a first sealing part that seals the gap between the outer filter and the filter holder and a second sealing part that seals the gap between the outer filter and the inner filter, wherein the sealing member comprises: a base extended along a lower surface of the seating end of the outer filter and coupled to the outer filter; the first sealing part protruding from one end of the base to an outside and extended in an inclined direction toward the filter holder; a connector extended from the base and covering an outside edge of the seating end; and the second sealing part protruding from an outer surface of the connector covering an upper surface of the seating end toward the inner filter, and characterized in that the second sealing part is positioned at a location retracted inward from the connector of the sealing member covering a lateral surface of the seating end of the outer filter toward a center of the filter mounting space accommodating the inner filter. a base extended along a lower surface of the seating end of the outer filter and coupled to the outer filter; the first sealing part protruding from one end of the base to an outside and extended in an inclined direction toward the filter holder; a connector extended from the base and covering an outside edge of the seating end; and the second sealing part protruding from an outer surface of the connector covering an upper surface of the seating end toward the inner filter, and characterized in that the second sealing part is positioned at a location retracted inward from the connector of the sealing member covering a lateral surface of the seating end of the outer filter toward a center of the filter mounting space accommodating the inner filter.