There is obtained an internal combustion engine fuel injection valve in which, by suppressing increase in production costs, deterioration in the accuracy of a flow rate, and variations in various kinds of characteristics caused by a change in the atmospheric air pressure, the quality of atomized fuel spray is improved.
An injection hole plate 11 is disposed in such a way that an extended line 10d along the plane of a valve seat portion of a valve seat whose diameter is gradually reduced in the downstream direction and an upstream plane 11c of the injection hole plate 11 intersect each other so that a virtual circle 11d is formed; by recessing part of the upstream side of the injection hole plate 11 at a plurality of positions along the valve seat opening portion 10b, a plurality of fuel chambers 15 is formed; the fuel chamber 15 is in a shape, the halves of which are symmetric with each other with respect to a line that radially extends from the center of the injection hole plate 11, and is disposed in a place that ranges from the inside of the virtual circle 11d to the outside of the inner circumference of the valve seat opening portion 10b; and in each of the fuel chambers 15, two injection holes 12 are arranged outside the inner circumference of the valve seat opening portion 10b in such a way as to flank the radial center line of the fuel chamber 15.