PURPOSE: To atomize sufficiently fuel even in low fuel pressure while achieving an optimum air-fuel ratio for the running condition of an engine by a constitution consisting of a slit for passing fuel, a linear actuator, controlling means, etc.

CONSTITUTION: Three slits 19 for flowing fuel are formed longitudinally in the side wall of a pipe member 18. Fuel reaches a pipe member 18 arranging section through a duty control type solenoid valve 17 and then a fuel path in a linear actuator 12 and injected from an injection port 10 through three slits 19. Thus, when the opening area of the slit 19 is adjusted by a movable rod 11, fuel injection amount can be adjusted according to the opening area. Further, fuel flow injected from a fuel injection section 9 is controlled by a fuel flow controlling means.