Provided is a piezoelectric power generator that has an overall compact size and in which a plurality of piezoelectric elements having a low natural frequency of vibration and that generate a large amount of power can be arranged in a compact manner.A piezoelectric power generator includes a first and second piezoelectric elements, which each have a cantilever structure, fixed to the top of two opposing side walls of a housing. The first piezoelectric element and the second piezoelectric element are arranged so as to oppose each other in an alternating manner and respectively have a first weight and a second weight joined to free ends thereof. Unused spaces formed below the fixed end sides of the piezoelectric elements are used as spaces in which the weights can move by positioning one of the weights under the fixed end side of the other of the piezoelectric elements.