An air conditioner having an indoor unit that includes a heat exchanger and an indoor fan operable to convey air heat exchanged by the heat exchanger, the indoor unit having a discharge opening defined therein, through which the air conveyed by the indoor fan is blown out, said air conditioner comprising: a partition wall that partitions an inside of the indoor unit into first and second compartments with the heat exchanger and the indoor fan accommodated within the first compartment, the first compartment defining a main passage through which the air conveyed by the indoor fan is conveyed before the air is blown out through the discharge opening, the second compartment acting as a bypass passage for bypassing the heat exchanger and the indoor fan, the partition wall having an opening defined therein through which the first and second compartments communicate with each other; and an electrostatic atomizing unit accommodated within the second compartment and operable to generate dew condensation using moisture contained in air, then generate an electrostatic mist by high voltage discharge, and discharge the electrostatic mist, said electrostatic atomizing unit comprising: a Peltier element operable to generate dew condensation water by cooling; a discharge electrode operable to cause the high voltage discharge to generate the electrostatic mist from the dew condensation water; and a radiating portion operable to dissipate heat from the Peltier element, the radiating portion comprising a plurality of fins with air gaps defined therebetween; wherein operation of the indoor fan generates a negative pressure inside the main passage to thereby introduce air inside the second compartment into the first compartment through the opening in the partition wall; and wherein the air gaps between the plurality of fins are formed substantially in a direction in which the air introduced from the second compartment into the first compartment flows. a partition wall that partitions an inside of the indoor unit into first and second compartments with the heat exchanger and the indoor fan accommodated within the first compartment, the first compartment defining a main passage through which the air conveyed by the indoor fan is conveyed before the air is blown out through the discharge opening, the second compartment acting as a bypass passage for bypassing the heat exchanger and the indoor fan, the partition wall having an opening defined therein through which the first and second compartments communicate with each other; and an electrostatic atomizing unit accommodated within the second compartment and operable to generate dew condensation using moisture contained in air, then generate an electrostatic mist by high voltage discharge, and discharge the electrostatic mist, said electrostatic atomizing unit comprising: a Peltier element operable to generate dew condensation water by cooling; a discharge electrode operable to cause the high voltage discharge to generate the electrostatic mist from the dew condensation water; and a radiating portion operable to dissipate heat from the Peltier element, the radiating portion comprising a plurality of fins with air gaps defined therebetween; a Peltier element operable to generate dew condensation water by cooling; a discharge electrode operable to cause the high voltage discharge to generate the electrostatic mist from the dew condensation water; and a radiating portion operable to dissipate heat from the Peltier element, the radiating portion comprising a plurality of fins with air gaps defined therebetween; wherein operation of the indoor fan generates a negative pressure inside the main passage to thereby introduce air inside the second compartment into the first compartment through the opening in the partition wall; and wherein the air gaps between the plurality of fins are formed substantially in a direction in which the air introduced from the second compartment into the first compartment flows.