Provided are wearable devices including a thermoelectric generator. The wearable devices include a main body that has at least one opening and a thermoelectric generator that is seated in the opening. The devices include a pair of terminals that are electrically connected to an adjacent thermoelectric generator or a charge unit disposed on the main body, and a supporting member that is situated on a lower part of the thermoelectric generator and contacts the skin of a user, such that the thermoelectric generator includes a high temperature unit and a low temperature unit facing each other, and the high temperature unit is situated on the supporting member and the low temperature unit is disposed to face an outside environment.