Fuel injection valve

This invention serves to suppress the deterioration of oil tightness of a valve after welding without any change in the direction of fuel injection even with deformation of a convex portion after welding of an injection opening plate to a valve seat, as well as without any variation in the direction of fuel injection due to welding variation.; In this invention, in a fuel injection valve which has a valve body for opening and closing a valve seat, and receives an operation signal from a control unit to operate the valve body so that fuel is injected from a plurality of injection holes formed in an injection hole plate welded through a welded portion to a downstream side of the valve seat while passing through a gap between the valve body and the valve seat, said injection hole plate has a convex portion protruding to a downstream side substantially in parallel to a tip end portion of said valve body. An extension of a valve seat portion of said valve seat crosses said injection hole plate diametrically outside of said convex portion. Inlet portions of said injection holes are disposed at locations diametrically outside of said convex portion and diametrically inside of a valve seat opening inner wall which is a minimum inside diameter of said valve seat. Further, an overhead height h of each of said injection holes, represented by a distance of the tip end portion of said valve body from the center of each of said inlet portions of said injection holes in a direction of a valve seat axis, and an inlet diameter d of each of said injection holes has a relation of h ‰¤ 1.5 d in a valve opened state.