A clothes treating apparatus comprising: an accommodating space configured to receive one or more clothing articles; a duct unit configured to guide discharge of air from the accommodating space to outside of the accommodating space; an air supply unit configured to supply either air in the duct or external air to the accommodating space; and a filter assembly positioned to filter air discharged from the accommodating space through the duct unit, the filter assembly comprising: a housing; a filter positioned in the housing and configured to filter substances from air passing through the filter assembly; and a substance removal unit configured to move substances remaining on a portion of the filter and press substances moved from the filter into a storage area defined within the housing, the storage area being configured to collect removed substances within the housing, wherein the substance removal unit includes a brush contacting the filter and a rotating arm to rotate the brush, characterized in that: the brush is configured to reciprocally rotate within a predetermined angle range for moving substances remaining on the filter to the storage area and compressing the substances stored in the storage area, wherein the storage area includes: an overlapping portion that overlaps with the predetermined angle range of the brush, the overlapping portion being less than all of the storage area; and a non-overlapping portion that does not overlap with the predetermined angle range of the brush, the non-overlapping portion being less than all of the storage area; and wherein the brush is configured to compress substances collected in the storage area by pressing substances in the overlapping portion of the storage area toward the non-overlapping portion of the storage area. an accommodating space configured to receive one or more clothing articles; a duct unit configured to guide discharge of air from the accommodating space to outside of the accommodating space; an air supply unit configured to supply either air in the duct or external air to the accommodating space; and a filter assembly positioned to filter air discharged from the accommodating space through the duct unit, the filter assembly comprising: a housing; a filter positioned in the housing and configured to filter substances from air passing through the filter assembly; and a substance removal unit configured to move substances remaining on a portion of the filter and press substances moved from the filter into a storage area defined within the housing, the storage area being configured to collect removed substances within the housing, wherein the substance removal unit includes a brush contacting the filter and a rotating arm to rotate the brush, characterized in that: the brush is configured to reciprocally rotate within a predetermined angle range for moving substances remaining on the filter to the storage area and compressing the substances stored in the storage area, wherein the storage area includes: an overlapping portion that overlaps with the predetermined angle range of the brush, the overlapping portion being less than all of the storage area; and a non-overlapping portion that does not overlap with the predetermined angle range of the brush, the non-overlapping portion being less than all of the storage area; and wherein the brush is configured to compress substances collected in the storage area by pressing substances in the overlapping portion of the storage area toward the non-overlapping portion of the storage area. a housing; a filter positioned in the housing and configured to filter substances from air passing through the filter assembly; and a substance removal unit configured to move substances remaining on a portion of the filter and press substances moved from the filter into a storage area defined within the housing, the storage area being configured to collect removed substances within the housing, wherein the substance removal unit includes a brush contacting the filter and a rotating arm to rotate the brush, the brush is configured to reciprocally rotate within a predetermined angle range for moving substances remaining on the filter to the storage area and compressing the substances stored in the storage area, wherein the storage area includes: an overlapping portion that overlaps with the predetermined angle range of the brush, the overlapping portion being less than all of the storage area; and a non-overlapping portion that does not overlap with the predetermined angle range of the brush, the non-overlapping portion being less than all of the storage area; and wherein the brush is configured to compress substances collected in the storage area by pressing substances in the overlapping portion of the storage area toward the non-overlapping portion of the storage area. an overlapping portion that overlaps with the predetermined angle range of the brush, the overlapping portion being less than all of the storage area; and a non-overlapping portion that does not overlap with the predetermined angle range of the brush, the non-overlapping portion being less than all of the storage area; and wherein the brush is configured to compress substances collected in the storage area by pressing substances in the overlapping portion of the storage area toward the non-overlapping portion of the storage area.