A laundry treatment apparatus comprising: a drying chamber defining a space configured to receive laundry therein; a supply unit configured to supply at least one of air or moisture to the drying chamber ; a support unit including a support body disposed in the drying chamber , a hanger (H1) being hung on the support body , a first connecting body connecting one end of the support body to an upper surface of the drying chamber , and a second connecting body connecting a remaining end of the support body to the upper surface of the drying chamber ; a rotating shaft extending through the upper surface of the drying chamber ; a rotating arm fixed to one end of the rotating shaft and configured to be rotated in the drying chamber ; a conversion unit provided at the support body and configured to convert rotational movement of the rotating arm into reciprocating movement of the support body ; a disc-shaped driven unit fixed to a remaining end of the rotating shaft and positioned outside the drying chamber ; a drive unit (D) configured to provide force required for rotation of the driven unit ; a weight fixed to the driven unit and positioned in a direction opposite a direction in which the rotating arm extends from the rotating shaft ; characterized in that the conversion unit includes a slot member fixed to the support body below the rotating arm and an engaging member fixed at one end thereof to the rotating arm and inserted at a remaining end thereof into the slot member, the slot member being formed in a direction perpendicular to a direction in which the support body moves; and wherein the slot member has a length set to be equal to or greater than a diameter of a rotational orbit of the engaging member . a drying chamber defining a space configured to receive laundry therein; a supply unit configured to supply at least one of air or moisture to the drying chamber ; a support unit including a support body disposed in the drying chamber , a hanger (H1) being hung on the support body , a first connecting body connecting one end of the support body to an upper surface of the drying chamber , and a second connecting body connecting a remaining end of the support body to the upper surface of the drying chamber ; a rotating shaft extending through the upper surface of the drying chamber ; a rotating arm fixed to one end of the rotating shaft and configured to be rotated in the drying chamber ; a conversion unit provided at the support body and configured to convert rotational movement of the rotating arm into reciprocating movement of the support body ; a disc-shaped driven unit fixed to a remaining end of the rotating shaft and positioned outside the drying chamber ; a drive unit (D) configured to provide force required for rotation of the driven unit ; a weight fixed to the driven unit and positioned in a direction opposite a direction in which the rotating arm extends from the rotating shaft ; characterized in that the conversion unit includes a slot member fixed to the support body below the rotating arm and an engaging member fixed at one end thereof to the rotating arm and inserted at a remaining end thereof into the slot member, the slot member being formed in a direction perpendicular to a direction in which the support body moves; and wherein the slot member has a length set to be equal to or greater than a diameter of a rotational orbit of the engaging member . <EOS>