NOVELTY - The generator has a substrate i.e. printed circuit board (100), comprising a piezoelectric upper electrode (112) for transmitting power to an exterior. A metal plate (120) is formed on the substrate. A piezoelectric body (110) is located on the plate and transmits the power generated by a piezoelectric material to the electrode. A mass (130) is formed on the plate and increases a deformation range of the plate when vibration is applied to the plate. The plate comprises a bridge structure with a set of legs about the mass. A housing is connected to the substrate and surrounds the plate.    USE - Piezoelectric power generator for use in a wireless sensor network of a tire pressure monitoring system (TPMS) for monitoring variation in air pressure in a tire for an automobile i.e. car, and as a power source in a battery. Can also be used in a wireless sensor module for a marine observation system for measuring wind speed and wave height.    ADVANTAGE - The generator solves the problem related to an output power and sufficiently supplies the power to a tire pressure monitoring system. The piezoelectric body utilizes piezoelectric ceramic material as bulk lead zirconate titanate (PZT), aluminum nitride (A1N) and lead zinc niobatelead titanate (PZN-PT) such that displacement of the piezoelectric body is maximized within a range of mechanical yield strength. The generator supplies the power to a sensor module applied to a wireless sensor network, so that environmental information can be provided from the sensor module with a vibration-existing range, thus solving the problem of supplying power required for the wireless sensor network with no battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a piezoelectric power generator having upper and lower masses at a center part of a membrane structure.    Printed circuit board (100)    Piezoelectric body (110)    Piezoelectric upper electrode (112)    Insulating epoxy (116)    Metal plate (120)    Mass (130)