Fuel injection valve

A fuel injection valve comprising:

• a nozzle body having an injection hole, which is configured to inject fuel, and a valve seat formed around an inner opening of the injection hole;
• a needle abuttable against the valve seat, the needle configured to restrict fuel from flowing between an inside and an outside of the nozzle body through the injection hole when the needle abuts against the valve seat and to permit fuel to flow between the inside and the outside of the nozzle body through the injection hole when the needle is lifted from the valve seat;
• and
• a driver configured to move the needle back and forth, wherein
• the injection hole is formed such that its cross-sectional area is continually enlarged from the inner opening toward an outer opening of the injection hole,
• the needle is movable back and forth along a center axis of the nozzle body,
• the needle is movable in a valve closing direction along the center axis to abut against the valve seat,
• an injection hole passage of the injection hole communicates the inner opening with the outer opening,
• the injection hole passage is defined by a first inner wall and a second inner wall,
• the first inner wall is located in a valve closing direction to an injection hole axis of the injection hole,
• the second inner wall is located on a side opposite to the valve closing direction s-Me relative to the injection hole axis, the second inner wall is closer to the injection hole axis than the first inner wall,
• a plane Including the injection hole axis and facing the center axis or a plane including the injection hole axis and including the center axis is defined as a first virtual plane:
• and
• a cross section of the first inner wall taken along a second virtual plane, which intersects perpendicularly with the injection hole axis, is formed in a circular arc shape of a virtual circle centered on a point on the injection hole axis.