Disclosed is a clothes treatment apparatus including a first case including an upper wall, a lower wall, a left wall, a right wall, a rear wall, and a front wall, a second case including an upper wall, a lower wall, a left wall, a right wall, a rear wall, and a front wall, a width-direction bracket for coupling at least one of the front walls or the rear walls of the first case and the second case to each other in a width direction, a depth-direction bracket for coupling at least one of the upper walls or the lower walls of the first case and the second case to each other in a depth direction, and a height-direction bracket for coupling at least one of the front walls or the rear walls of the first case and the second case to each other in a height direction. At least two of the width-direction bracket, the depth-direction bracket, or the height-direction bracket fix at least two surfaces of the first case and the second case, whereby it is possible to improve the rigidity of the clothes treatment apparatus against external force and to maximally prevent vibration generated in one of the cases from being transmitted to the other case.