Fuel injection valve

A fuel injection valve comprising:

• a valve seat and a valve body that cooperatively open and close a fuel passage;
• a movable element including the valve body provided at one end part thereof and a movable iron core provided at another end part thereof;
• a fixed iron core disposed to face the movable iron core and to attract the movable iron core by applying a magnetic attraction force to the movable iron core;
• and
• a cylindrical member including thereinside the fixed iron core and the movable iron core,
• wherein the cylindrical member is formed of magnetic material and provided with a non-magnetic part or a part having weaker magnetism than the magnetic material at an outer circumferential part of a facing part at which a facing end surface of the fixed iron core and a facing end surface of the movable iron core face each other,
• wherein the fixed iron core includes a reduced-diameter part on an outer circumferential surface at a side facing the movable iron core,
• wherein the movable iron core includes a reduced-diameter part on an outer circumferential surface at a side facing the fixed iron core,
• wherein an end part, on a side opposite the side facing the movable iron core, of the reduced-diameter part of the fixed iron core is located closer to the side opposite the side facing the movable iron core than an end part on a side opposite the side facing the movable iron core of the non-magnetic part or the part having weaker magnetism, and
• wherein when the valve is opened, an end part on a side opposite the side facing the fixed iron core of the reduced-diameter part of the movable iron core is located closer to the side opposite the side facing the fixed iron core than an end part on a side opposite the side facing the fixed iron core of the non-magnetic part or the part having weaker magnetism.