The dehumidifier, according to one embodiment of the present invention, comprises: a variable compressor which varies the rotation speed of a driving shaft according to an input control signal and adjusts an amount of a refrigerant gas compressed by the rotation of the driving shaft; a condenser for liquefying the compressed refrigerant gas received from the variable compressor; a heat exchanger for cooling flown air by vaporizing the liquefied refrigerant gas, and condensing vapors of the flown air into water to remove the water by using the cooling air; a blower fan for supplying outside air to the heat exchanger by forming an air flow according to the driving speed of a blower motor; and a control unit for generating the control signal according to the input signal so as to adjust the rotation speed of the driving shaft.