A clothes treatment apparatus includes a cabinet including an inlet, a first chamber positioned inside the cabinet and defining a space for accommodating clothes through the inlet, and a hanger bar positioned in the first chamber and configured to hold clothes accommodated in the first chamber. The apparatus further includes a driver including: a motor configured to generate torque; a vibrating body configured to support the motor and vibrate alternately in opposite rotation directions by rotation of the motor; and a motion converter configured to rotate together with the vibrating body and convert the vibration of the vibrating body in connection with the hanger bar such that the hanger bar reciprocates along a predetermined movement direction. The hanger bar is configured to reciprocate with different amplitudes and periods depending on a number of times that the motor rotates.