A power generating element which generates electric power by converting vibration energy into electric energy, the power generating element, comprising: a plate-like bridge portion which is placed on a plane parallel to an XY plane of an XYZ three-dimensional coordinate system having an X-axis, a Y-axis and a Z-axis, said plate-like bridge portion being a plate-like member extending from a base end to a leading end along the Y-axis and having flexibility; a pedestal which supports and fixes a base end of the plate-like bridge portion; a weight body which is directly or indirectly connected to a leading end of the plate-like bridge portion; and a piezoelectric element (E0, 105, E1-E4) which is fixed at a predetermined position on a surface of the plate-like bridge portion at which expansion/contraction deformation occurs; wherein when a side in which an X coordinate value is negative is defined as a left side and a side in which an X coordinate value is positive is defined as a right side with respect to both sides of the plate-like bridge portion, the weight body is provided with a left-hand side weight body portion which is positioned on the left side and a right-hand side weight body portion which is positioned on the right side; characterized in that the piezoelectric element is provided with a leading end piezoelectric element (E1, E2) which is arranged in a vicinity of the leading end of the plate-like bridge portion and a base end piezoelectric element (E3, E4) which is arranged in a vicinity of the base end of the plate-like bridge portion; when the weight body undergoes displacement in the Y-axis direction, charge is generated on both of the leading end piezoelectric element (E1, E2) and the base end piezoelectric element (E3, E4); and when the weight body undergoes displacement in the Z-axis direction, charge is generated on both of the leading end piezoelectric element (E1, E2) and the base end piezoelectric element (E3, E4). a plate-like bridge portion which is placed on a plane parallel to an XY plane of an XYZ three-dimensional coordinate system having an X-axis, a Y-axis and a Z-axis, said plate-like bridge portion being a plate-like member extending from a base end to a leading end along the Y-axis and having flexibility; a pedestal which supports and fixes a base end of the plate-like bridge portion; a weight body which is directly or indirectly connected to a leading end of the plate-like bridge portion; and a piezoelectric element (E0, 105, E1-E4) which is fixed at a predetermined position on a surface of the plate-like bridge portion at which expansion/contraction deformation occurs; wherein when a side in which an X coordinate value is negative is defined as a left side and a side in which an X coordinate value is positive is defined as a right side with respect to both sides of the plate-like bridge portion, the weight body is provided with a left-hand side weight body portion which is positioned on the left side and a right-hand side weight body portion which is positioned on the right side; characterized in that the piezoelectric element is provided with a leading end piezoelectric element (E1, E2) which is arranged in a vicinity of the leading end of the plate-like bridge portion and a base end piezoelectric element (E3, E4) which is arranged in a vicinity of the base end of the plate-like bridge portion; when the weight body undergoes displacement in the Y-axis direction, charge is generated on both of the leading end piezoelectric element (E1, E2) and the base end piezoelectric element (E3, E4); and when the weight body undergoes displacement in the Z-axis direction, charge is generated on both of the leading end piezoelectric element (E1, E2) and the base end piezoelectric element (E3, E4).