Abstract: An energy harvesting device configured to convert thermal energy into electrical energy includes a heat storage portion configured to store thermal energy, a thermoelectric element configured to eliminate a temperature difference between electrodes when converting thermal energy into electrical energy, and an insulating portion in contact with the heat storage portion and the thermoelectric element. The heat storage portion has insulating properties. The thermoelectric element includes a pair of electrodes having work functions different from each other, and an intermediate portion provided between the pair of electrodes. The thermoelectric element is provided in contact with the heat storage portion and is covered by the insulating portion.

Abstract: A power generation element that does not require a temperature difference between electrodes in converting thermal energy into electric energy includes a first electrode, an intermediate portion provided on the first electrode, the intermediate portion including a fine particle exhibiting a perovskite structure, and a second electrode provided on the intermediate portion, the second electrode having a work function different from a work function of the first electrode.