The fact that the spray characteristics of automotive fuel injectors of direct injection type are substantially influenced by cavitation in the nozzles is widely known. Many researchers have been engaged in understanding the relation between a cavitating flow and characteristics of fuel spray using a numerical simulation till now. In a free surface flow analysis and a multiphase flow analysis, advantages of using a particle-based meshless method are utilized. However, particle-based meshless methods have not been used to simulate cavitation. In this study, the cavitation in a two-dimensional nozzle and the water jet were simulated using Moving Particle Semi-implicit (MPS) method employing a cavitation model. The simulation results are relatively close to experimental data.