Fuel-injection valve

A fuel-injection valve including a fuel-injection hole, a valve element and a valve seat for opening and closing said fuel-injection hole and a force-applying member for applying force in a direction of motion of said valve element to said valve element,

• wherein said fuel-injection valve further comprises a primary oscillation system, that includes said valve element and said force-applying member, and a secondary oscillation system added to said primary oscillation system;
• further comprising a drive unit for applying force to said valve element in a direction opposite to that applied by said force-applying member, wherein said drive unit includes a coil and an electromagnet with a magnetic circuit;
• said force-applying member includes a spring for pressing said valve element against said valve seat;
• said primary oscillation system includes said valve element and said spring;
• and said secondary oscillation system includes a linked movable member provided between said spring and said valve element, which can be moved in the direction of motion of said valve element, and an elastic part functioning as a spring, which can deform in said direction of motion of said valve element, wherein said magnetic circuit includes an inner iron core provided inside said coil, a hole penetrating said inner iron core along the center axis of said inner iron core in said direction of motion of said valve element, and an outer iron core provided outside said coil;
• and said spring, which is a part of said primary oscillation system, and said linked movable member are inserted in said hole.