Disclosed is a dehumidifier, having a compressor, a condenser, an expansion device, and an evaporator through which refrigerant is circulated, including a casing having an air inlet and an air outlet formed therein, a first passage for drawing air through the air inlet, and discharging the air through the air outlet after passed through the evaporator, the condenser, a first fan, and a second fan in succession, and a second passage for drawing the air through the air inlet and discharging the air through the air outlet after passed through the second fan, thereby, not only increasing the flow rate of the air passing through the condenser enabling to reduce a condensing temperature, but also discharging the air passed through the condenser mixed with the air drawn into the second passage enabling to drop the temperature of the air being discharged to the air outlet, permitting to resolve user's inconvenience.