Pulsated orifice injection apparatus was devised for the preparation of monodispersed metal particles, in which molten metal was injected from a small orifice by a clipping action of a pressure transmitting diaphragm given by a piezoelectric actuator. While the displacement of the diaphragm was varied, each pulse pressure yielded a liquid droplet having a size almost equal to the orifice diameter. The standard deviation of the mean diameter of the particles is 15%, which is about the same as that for sol-gel particles. The effect of process parameters, such as injection rate, pulse frequency, injection atmosphere and cooling rate on the particle formation, as well as the kinetics of liquid droplet injection, is discussed.