Fuel injection valve

A fuel injection valve, comprising:

• a valve housing having an injection hole injecting a fuel into an internal combustion engine and a valve seat surface tapering toward a downstream side on an upstream side with respect to the injection hole;
• a valve component which is accommodated in the valve housing, and is coaxially separated from or seated on the valve seat surface for valve opening or valve closing to allow intermittent fuel injection from the injection hole;
• and
• an elastic component biasing the valve component toward the valve seat surface, wherein
• the valve component includes a cylindrical portion and a tip end,
• the tip end includes:
• an inner convex surface curved in a partial spherical shape with a predetermined first curvature radius,
• an outer convex surface that is provided continuously to a valve peripheral surface of the cylindrical portion and further continuously to an outer peripheral side of the inner convex surface, the outer convex surface curved in a partial spherical shape having a constant second curvature radius smaller than the inner convex surface,
• a boundary portion between the inner convex surface and the outer convex surface protrudes toward the valve seat surface, and
• the constant second curvature radius of the outer convex surface extends continuously between the cylindrical portion and the boundary portion;
• and
• the tip end of the valve component is able to be seated on the valve seat surface only at the boundary portion.