A laundry treatment device, comprising: a cabinet (100, 200) that forms an exterior of the laundry treatment device; a tub mounted in the cabinet that accommodates washing water; a drum rotatably mounted in the tub configured to receive laundry therein; a heat pump module mounted under the tub that supplies heated air to the drum, the heat pump module having an inlet duct configured to receive air from the drum, and an outlet duct configured to discharge the heated air; and a filter module mounted to be accessible through a lower side of a front of the cabinet that filters air, wherein the filter module has a receiving space configured to receive foreign matter that falls down from the inlet duct, wherein the filter module includes: a filter member (242, 244) that filters foreign matter; and a filter guiding member that detachably supports the filter member (242, 244), wherein the filter member (242, 244) includes: a first filter that filters lint produced from the laundry and foreign matter; and a second filter that filters particles relatively smaller than that filtered by the first filter, characterized in that the filter guiding member includes: a supporting member coupled to the inlet duct; and a filter sliding member disposed in the supporting member so as to be detachably coupled to an inside of a lower side of the inlet duct with one end exposed from the cabinet, and wherein the inlet duct has a receiving space having one lower side opening configured to receive the filter sliding member therein. a cabinet (100, 200) that forms an exterior of the laundry treatment device; a tub mounted in the cabinet that accommodates washing water; a drum rotatably mounted in the tub configured to receive laundry therein; a heat pump module mounted under the tub that supplies heated air to the drum, the heat pump module having an inlet duct configured to receive air from the drum, and an outlet duct configured to discharge the heated air; and a filter module mounted to be accessible through a lower side of a front of the cabinet that filters air, wherein the filter module has a receiving space configured to receive foreign matter that falls down from the inlet duct, wherein the filter module includes: a filter member (242, 244) that filters foreign matter; and a filter guiding member that detachably supports the filter member (242, 244), a filter member (242, 244) that filters foreign matter; and a filter guiding member that detachably supports the filter member (242, 244), wherein the filter member (242, 244) includes: a first filter that filters lint produced from the laundry and foreign matter; and a second filter that filters particles relatively smaller than that filtered by the first filter, characterized in that the filter guiding member includes: a supporting member coupled to the inlet duct; and a filter sliding member disposed in the supporting member so as to be detachably coupled to an inside of a lower side of the inlet duct with one end exposed from the cabinet, and a first filter that filters lint produced from the laundry and foreign matter; and a second filter that filters particles relatively smaller than that filtered by the first filter, characterized in that the filter guiding member includes: a supporting member coupled to the inlet duct; and a filter sliding member disposed in the supporting member so as to be detachably coupled to an inside of a lower side of the inlet duct with one end exposed from the cabinet, and a supporting member coupled to the inlet duct; and a filter sliding member disposed in the supporting member so as to be detachably coupled to an inside of a lower side of the inlet duct with one end exposed from the cabinet, and wherein the inlet duct has a receiving space having one lower side opening configured to receive the filter sliding member therein.