PURPOSE: To improve an atomizing characteristic of fuel, by forming a curved surface part in a tip at the valve seat side of a valve member of a valve disk being opened by excitation of a magnetic coil and attaching a pin member to this curved surface part, while installing a device which swirls the fuel be tween the valve disc and a nozzle body.

CONSTITUTION: In a nozzle body 2 to be attached to the lower part of a cylindrical housing 1, a valve seat 5 is formed in a lower inner surface, and a fuel injection hole 6 is installed in the lower shaft center. And, a shaft stem (valve member) 3 forming a principal part of a valve disk 4 is housed in this body 2 free of slide motion, and a movable core 21 is displaced upward against a spring 20 by dint of excitation of a magnetic coil 11 whereby fuel is made to be sprayed out of the fuel injection hole 6. In this case, in the valve disc 4, a pin member 7 is attached to the curved surface part 3a formed at a tip of the shaft stem 3 in addition. And, a cylindrical member 8, installing a swirl groove 8a giving swirling force to injection fuel is installed interposingly between this valve disc 4 and the nozzle body 2.