To improve infection responsiveness of fuel by providing a holding part to reciprocate along a moving passage of a valve element separating from a seat surface at valve opening time as an energizing means to put the valve element in a valve closing condition by energizing it to the seat surface, and forming this holding part into a leaf spring to energize the valve element by directly coming into contact with it.

An injection valve 1 has on the tip side a cylindrical valve seat 3 sealed in and fitted to a cylinder, and a ball valve 5 as a valve element is energized in the valve closing direction to a seat surface 3a of the valve seat 3 by a leaf spring 6 as an energizing means. This leaf spring 6 is fixed to an end surface 7a of an annular adjusting screw 7 screw-fitted by a screw 3c formed on the tip side of the valve seat 3. The leaf spring 6 is composed of a circular thin spring material, and a central part is formed as a holding part 6a to hold this by coming into contact with the ball valve 5. This holding part 6a is composed of plural projecting pieces 6b extending toward the center, and a surface of the ball valve 5 is contacted with its tip 6c.