Patent ID: 7770823

Claim:
A fuel injector comprising a movable element having a seat contact surface formed at one end of the movable element, a nozzle member having a valve seat which the seat contact surface of the movable element is in contact with and seated on at the time of valve closing, and a nozzle holder portion having a cylindrical part into which the nozzle member is inserted to hold a periphery of the nozzle member, wherein an inner surface of the cylindrical part of the nozzle holder portion has a step portion with an inside corner portion that overlaps with an outside corner portion of one end of the nozzle member, wherein the outside corner portion of the nozzle member engages into the inside corner portion of the step portion of the nozzle holder portion in a stroke direction of the movable element to thereby be provided with a plastic deformation portion at the inside corner portion of the step portion of the nozzle holder portion, wherein the nozzle member maintains a fixed status securely to the nozzle holder portion in the stroke direction of the movable element by the plastic deformation portion, wherein the nozzle member and the nozzle holder portion are joined by welding, and wherein the amount of engagement between the nozzle member and the nozzle holder portion is equal to or greater than 15 μm and equal to or less than 350 μm in an axial direction of the fuel injector, and the overlap amount thereof in a radial direction of the fuel injector is equal to or greater than 0.02 mm and equal to or less than 0.5 mm.