FUEL INJECTOR

PURPOSE:To surely hold fuel in annular form and uniformly feed fuel by forming a flat part which extends to the whole outside on the outer periphery, crossing nearly at right angle with the axis center line in the longitudinal direction of a fuel injection passage, at the downstream side edge part of the expanded inclined projection part of a cone member which is arranged in the expanded inclined part of the fuel injection passage. CONSTITUTION:An expanded inclined part 6C whose inside diameter gradually spreads toward an opened port edge part 6B on the downstream side from an expansion starting point A of a fuel injection passage 6 is formed, and the inside diameter is spread continuously along the axis center line Y-Y in the longitudinal direction of the fuel injection passage 6. A cone member 9 arranged in the fuel injection passage 6 is constituted of an expanded inclined projection part 9A which is arranged in the expanded inclined part 6C of the fuel injection passage 6 and has an expanded part which is continuous toward the downstream side, cylindrical part 9B arranged in a fuel injection passage 6D of the upstream side from the expansion start point A, and a flat part 9D which is formed in the downstream side edge part 9C of the expanded inclined projection part 9A and has a gap (h) for the downstream side opened port edge part 6B of the expanded inclined part 6C of the fuel injection passage 6 and extends to the whole outside on the outer periphery, crossing nearly at right angle with the axis center line Y-Y in the longitudinal direction of the fuel injection passage 6.