Fuel injector

A fuel injector comprising:

• a cylindrical anchor;
• an armature including a plunger rod located in the center of the anchor and a seat valve provided at the tip of the plunger rod;
• a fixed core having a fuel inlet guiding fuel to a central portion;
• and
• a solenoid coil supplying a magnetic flux to a magnetic path containing a magnetic gap provided between an end face of the anchor and an end face of the fixed core,
• the fuel injector that drives the armature by attracting the anchor to the fixed core by a magnetic attractive force generated between the end face of the anchor and the end face of the fixed core by the magnetic flux passing through the magnetic gap and pulls the seat valve apart from a valve seat to open a fuel path,
• wherein
• a through hole passing through the anchor from a face thereof facing the fixed core to an opposite side is formed in such a way that the through hole has a large-diameter portion and a small-diameter portion,
• the large-diameter portion is located on a side where the fixed core is located with respect to the small-diameter portion, and
• a central axis of the large-diameter portion is offset to the outer periphery of the anchor with respect to a central axis of the small-diameter portion.