PURPOSE: To prevent the jumping motion of a plunger and obtain a stable injection characteristics from an injection port by a method wherein the valve is constituted so as to receive the restricting force of an elastic body in addition to the same force of a spring from a time on the way of the valve opening motion of the plunger.

CONSTITUTION: The valve is constituted so as to receive the restricting force of the elastic body in addition to the same force of the spring from a time on the way of the valve opening motion of the plunger 7. A coil spring 16a is utilized instead of the elastic body 16. According to this method, the jumping motion of the plunger 7 may be prevented and the stable flow amount characteristics of fuel may be obtained.