A cooling-cycle device and a cold/hot water dispenser comprising the same are disclosed. The cold/hot water dispenser includes a water supply source and a cooling-cycle device in a main body to cool water of the water supply source. The cooling-cycle device includes a compressor, a condenser, an expansion unit, and an evaporator arranged to constitute a closed circuit through a refrigerant pipe and to allow the water from the water supply source to be cooled by the evaporator. The compressor comprises a closed container, a compressing unit including a compressing compartment to perform compression of refrigerant, a driving unit including a low-speed motor having four poles or more to supply compressing power according to the compression of the refrigerant, and a turbocharger to increase the amount of the refrigerant flowing to the compressing compartment. Even with the low-speed motor employed as the driving unit, the compressor can remarkably reduce operational noise without deteriorating cooling capability.