A laundry treatment apparatus, comprising: - a cabinet having a laundry opening formed therein; - a laundry receiving device provided in the cabinet and configured to receive laundry therein through the laundry opening formed in the cabinet; - a hot air supply device, including: a circulation passage (41, 43, 47) configured to guide air discharged from the laundry receiving device and to resupply the air back into the laundry receiving device, wherein the circulation passage (41, 43, 47) extends in a diagonal direction across the upper portion of the laundry receiving device; a heat exchanger provided in the circulation passage (41, 43, 47); and a blower configured to circulate air from an interior of the laundry receiving device through the circulation passage (41, 43, 47) and back into the laundry receiving device; and wherein the laundry treatment apparatus further comprising: - a filter device positioned in the circulation passage (41, 43, 47) to filter air flowing to the heat exchanger, wherein the filter device is removable from the circulation passage (41, 43, 47) through a corresponding portion of the cabinet; - a filter separation/coupling passage positioned above the laundry opening formed in the cabinet and that penetrates the front surface of the cabinet; and - a filter guide connecting the filter separation/coupling passage and the circulation passage (41, 43, 47), wherein the filter guide is configured to guide the filter device into and out of the circulation passage (41, 43, 47); wherein the filter device includes: a filter body provided in the filter guide; a filter frame (55, 57) extending from the filter body into the circulation passage (41, 43, 47); and a filter (553, 573) supported in the filter frame (55, 57) to catch impurities in air flowing through the circulation passage (41, 43, 47); characterized in that: at least one of the filter body and the filter frame (55 57) is an elastic member; and the laundry treatment apparatus further comprises an impurity removal device configured to remove impurities accumulated on the filter (553, 573), wherein the impurity removal device includes a scraper coupled to the filter guide to separate impurities from the filter (553, 573) as the filter frame (55, 57) is withdrawn from or inserted into the circulation passage (41, 43, 47). - a cabinet having a laundry opening formed therein; - a laundry receiving device provided in the cabinet and configured to receive laundry therein through the laundry opening formed in the cabinet; - a hot air supply device, including: a circulation passage (41, 43, 47) configured to guide air discharged from the laundry receiving device and to resupply the air back into the laundry receiving device, wherein the circulation passage (41, 43, 47) extends in a diagonal direction across the upper portion of the laundry receiving device; a heat exchanger provided in the circulation passage (41, 43, 47); and a blower configured to circulate air from an interior of the laundry receiving device through the circulation passage (41, 43, 47) and back into the laundry receiving device; and a circulation passage (41, 43, 47) configured to guide air discharged from the laundry receiving device and to resupply the air back into the laundry receiving device, wherein the circulation passage (41, 43, 47) extends in a diagonal direction across the upper portion of the laundry receiving device; a heat exchanger provided in the circulation passage (41, 43, 47); and a blower configured to circulate air from an interior of the laundry receiving device through the circulation passage (41, 43, 47) and back into the laundry receiving device; and - a filter device positioned in the circulation passage (41, 43, 47) to filter air flowing to the heat exchanger, wherein the filter device is removable from the circulation passage (41, 43, 47) through a corresponding portion of the cabinet; - a filter separation/coupling passage positioned above the laundry opening formed in the cabinet and that penetrates the front surface of the cabinet; and - a filter guide connecting the filter separation/coupling passage and the circulation passage (41, 43, 47), wherein the filter guide is configured to guide the filter device into and out of the circulation passage (41, 43, 47); a filter body provided in the filter guide; a filter frame (55, 57) extending from the filter body into the circulation passage (41, 43, 47); and a filter (553, 573) supported in the filter frame (55, 57) to catch impurities in air flowing through the circulation passage (41, 43, 47); at least one of the filter body and the filter frame (55 57) is an elastic member; and the laundry treatment apparatus further comprises an impurity removal device configured to remove impurities accumulated on the filter (553, 573), wherein the impurity removal device includes a scraper coupled to the filter guide to separate impurities from the filter (553, 573) as the filter frame (55, 57) is withdrawn from or inserted into the circulation passage (41, 43, 47).