Patent ID: 7635098

Claim:
A fuel injection device comprising: a nozzle body formed with an injection hole for injecting fuel; and a nozzle needle reciprocating in the nozzle body along an axial direction to open and to close the injection hole, wherein the nozzle needle includes a sliding portion capable of moving in the nozzle body in a sliding manner, an insertion portion, of which diameter is smaller than that of the sliding portion, and a pressure receiving portion connecting the sliding portion with the insertion portion, the nozzle body includes a guide portion for slidably holding the sliding portion and a fuel sump chamber formed on the injection hole side of the guide portion so that the insertion portion is inserted through the fuel sump chamber, and the fuel sump chamber is formed with a second fuel sump chamber extending to an inside of the guide portion along the axial direction, wherein the second fuel sump chamber provides a substantially annular space radially outside the sliding portion.