A laundry treatment apparatus comprising: a drying chamber defining a space configured to receive laundry therein; a supply unit (31, 32, 34, 35) 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 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 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 (31, 32, 34, 35) 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 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 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.