Patent ID: 8002207

Claim:
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 said 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 said valve seat while passing through a gap between said valve body and said valve seat, characterized in that said injection hole plate is formed at its central portion with a convex portion which has a circular-arc shaped cross section and which is substantially axisymmetric with respect to a valve seat axis; said welded portion is substantially axisymmetric with respect to said valve seat axis; inlet portions of said injection holes are disposed in an injection hole arrangement surface 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; and said injection hole arrangement surface is coplanar with a surface having said welded portion.