A thermoelectric device including a heat supplier, a thermoelectric element disposed on the heat supplier, and a heat exchanger disposed opposite to the heat supplier, where the thermoelectric element is disposed between the heat supplier and the heat exchanger. In the thermoelectric device, the heat exchanger include a medium adsorptive part defined on a surface thereof, and the medium adsorptive part is exposed outside to contact with a first medium of the air and has an adsorptive property for a second medium including a fluid and different from the first medium.