Abstract: Disclosed is the dehumidifying apparatus for a dryer comprising: a case; a drum disposed inside the case and for receiving objects to be dried therein; and a hot air supplying unit for supplying hot air into the drum and drying the objects to be dried, the dehumidifying apparatus, comprising: a dehumidifying unit having a heat exchanger for cooling hot air flowing from the drum; and a water tank for containing a fluid supplied to the heat exchanger, wherein the fluid circulates between the heat exchanger and the water tank. The dehumidifying apparatus for a dryer may reduce an amount of water used for operating the dryer, prevent the waste of water, and stably supply recycled cool water to the heat exchanger from the water tank.