A stack-type laundry treating apparatus comprising: an upper treating apparatus including: an upper cabinet including an upper side panel defining an upper side appearance thereof, and an upper base panel defining a bottom thereof; a drying drum rotatably disposed in the upper cabinet, wherein a drying target is inserted into the drying drum; an upper driver for rotating the drying drum; and an air flow path for supplying and discharging air to and from the drying drum, a lower treating apparatus including: a lower cabinet including a lower side panel defining a lower side appearance thereof, wherein a top of the lower cabinet is covered with the upper base panel; a tub disposed in the lower cabinet, wherein washing-water is stored in the tub; a washing drum disposed inside the tub, wherein a washing target is inserted into the washing drum; and a lower driver for rotating the washing drum; and aligning legs interposed between the upper side panel and the lower side panel to space the upper side panel and the lower side panel from each other by a predefined vertical spacing, wherein the upper side panel has a bottom portion vertically and downwardly extending along the predefined vertical spacing, wherein each of the upper side panel and the lower side panel is made of a conductive material and the aligning legs are made of an electrically insulating material, and characterized in that: a rail frame is further disposed on a top of the lower side panel, wherein a spacing between the upper side panel and the lower side panel is larger than a thickness of the rail frame. an upper treating apparatus including: an upper cabinet including an upper side panel defining an upper side appearance thereof, and an upper base panel defining a bottom thereof; a drying drum rotatably disposed in the upper cabinet, wherein a drying target is inserted into the drying drum; an upper driver for rotating the drying drum; and an air flow path for supplying and discharging air to and from the drying drum, an upper cabinet including an upper side panel defining an upper side appearance thereof, and an upper base panel defining a bottom thereof; a drying drum rotatably disposed in the upper cabinet, wherein a drying target is inserted into the drying drum; an upper driver for rotating the drying drum; and an air flow path for supplying and discharging air to and from the drying drum, a lower treating apparatus including: a lower cabinet including a lower side panel defining a lower side appearance thereof, wherein a top of the lower cabinet is covered with the upper base panel; a tub disposed in the lower cabinet, wherein washing-water is stored in the tub; a washing drum disposed inside the tub, wherein a washing target is inserted into the washing drum; and a lower driver for rotating the washing drum; and aligning legs interposed between the upper side panel and the lower side panel to space the upper side panel and the lower side panel from each other by a predefined vertical spacing, wherein the upper side panel has a bottom portion vertically and downwardly extending along the predefined vertical spacing, a lower cabinet including a lower side panel defining a lower side appearance thereof, wherein a top of the lower cabinet is covered with the upper base panel; a tub disposed in the lower cabinet, wherein washing-water is stored in the tub; a washing drum disposed inside the tub, wherein a washing target is inserted into the washing drum; and a lower driver for rotating the washing drum; and aligning legs interposed between the upper side panel and the lower side panel to space the upper side panel and the lower side panel from each other by a predefined vertical spacing, wherein the upper side panel has a bottom portion vertically and downwardly extending along the predefined vertical spacing, wherein each of the upper side panel and the lower side panel is made of a conductive material and the aligning legs are made of an electrically insulating material, and characterized in that: a rail frame is further disposed on a top of the lower side panel, wherein a spacing between the upper side panel and the lower side panel is larger than a thickness of the rail frame. a rail frame is further disposed on a top of the lower side panel, wherein a spacing between the upper side panel and the lower side panel is larger than a thickness of the rail frame.