To enable to supply fuel from a fuel pump to a fuel injection device at low pressure and miniaturize the fuel pump and reduce quantity of deposit generation by applying high voltage to vaporize fuel and increase combustion pressure.

A fuel injection device 30 is mounted on an internal combustion engine and includes a fuel flow-in part 50 at one end, an injection part 31 at another end and a drive part 41 at a middle part in an axial direction. A fuel reservoir 53 storing fuel is formed in the fuel flow-in part or the valve drive part and an electrode 52 applying high voltage to fuel in the fuel reservoir is attached. Temperature of part of fuel is raised and vaporized by electrical discharge, volume of fuel in the fuel reservoir increases and pressure rises.