According to an embodiment of the present invention, an energy harvesting device includes at least one first magnet which can rotate making a first circle; at least one piezoelectric cantilever which is located away from a surface on which the first circle is located and can bend in the direction perpendicular to the surface on which the first circle is located; and at least one second magnet which is joined with the at least one piezoelectric cantilever and is overlapped with the first circle.
