This paper describes a method for obtaining an excellent spray under low injection pressure. Since the diesel nozzle, which is used in direct injection diesel engines, is a pressure atomized type nozzle, excellent spray characteristics can not be obtained under low injection pressure. When cavitation occurs in the nozzle hole, atomization of the liquid jet enhanced considerably. Based on the results of a previous study, a new method of enhancing atomization of the liquid jet at low injection pressure, which involves the use of a simple nozzle in which a gap made at the nozzle hole, is proposed. The spray characteristics of the nozzle invented in this study were compared with those at super-high injection pressure (δP i=200.MPa). The results of the present study indicated that enhancement of atomization of the liquid jet at low injection pressure (δPi = 10 MPa) is possible by simply making the gap and installing the bypass at a single hole nozzle.