A clothes treating apparatus, comprising: an accommodation chamber in which an object is accommodated; a first heat pump cycle having a first evaporator, a first compressor, a first condenser and a first expansion valve; a second heat pump cycle having a second evaporator, a second compressor, a second condenser and a second expansion valve, and arranged such that air introduced into the accommodation chamber passes through the first evaporator, the second evaporator, the second condenser and the first condenser, sequentially; and a controller configured to control an operation of the first and second heat pump cycles (140, 150), characterized in that: at least one of the first and second compressors (143, 153) is provided with an inverter for changing a driving speed of the compressor through a frequency conversion, wherein the controller is configured to drive at least one of the first compressor and the second compressor within a preset driving range, by controlling the driving speed of at least one of the first and second compressors (143, 153) using the inverter, wherein at least one of the first compressor and the second compressor is adapted to be driven in a first mode where the driving speed is constant as a first speed, and a second mode where the driving speed is varied from the first speed to a second speed, and wherein at least one of the first and second compressors (143, 153) is adapted to be driven in the first and second modes, and then in a third mode where the driving speed is maintained as the second speed. an accommodation chamber in which an object is accommodated; a first heat pump cycle having a first evaporator, a first compressor, a first condenser and a first expansion valve; a second heat pump cycle having a second evaporator, a second compressor, a second condenser and a second expansion valve, and arranged such that air introduced into the accommodation chamber passes through the first evaporator, the second evaporator, the second condenser and the first condenser, sequentially; and a controller configured to control an operation of the first and second heat pump cycles (140, 150), characterized in that: at least one of the first and second compressors (143, 153) is provided with an inverter for changing a driving speed of the compressor through a frequency conversion, wherein the controller is configured to drive at least one of the first compressor and the second compressor within a preset driving range, by controlling the driving speed of at least one of the first and second compressors (143, 153) using the inverter, wherein at least one of the first compressor and the second compressor is adapted to be driven in a first mode where the driving speed is constant as a first speed, and a second mode where the driving speed is varied from the first speed to a second speed, and wherein at least one of the first and second compressors (143, 153) is adapted to be driven in the first and second modes, and then in a third mode where the driving speed is maintained as the second speed. at least one of the first and second compressors (143, 153) is provided with an inverter for changing a driving speed of the compressor through a frequency conversion, wherein the controller is configured to drive at least one of the first compressor and the second compressor within a preset driving range, by controlling the driving speed of at least one of the first and second compressors (143, 153) using the inverter, wherein at least one of the first compressor and the second compressor is adapted to be driven in a first mode where the driving speed is constant as a first speed, and a second mode where the driving speed is varied from the first speed to a second speed, and wherein at least one of the first and second compressors (143, 153) is adapted to be driven in the first and second modes, and then in a third mode where the driving speed is maintained as the second speed.