Injector

An injector for an internal combustion engine, comprising:

• a nozzle body that is adapted to be inserted and disposed in a cylinder head of the engine and that includes an injection hole through which high pressure fuel is injected;
• a main body that has a cylindrical shape extending in a direction of insertion of the nozzle body in the cylinder head and that includes:
• a supply port formed on an outer peripheral surface of the main body, wherein high pressure fuel is supplied into the main body through the supply port;
• and
• a high pressure passage through which high pressure fuel flows from the supply port toward the injection hole and which has:
• a first passage extending from the supply port in a radial direction of the main body;
• and
• a second passage extending from a fuel downstream end portion of the first passage toward the injection hole in the direction of insertion of the nozzle body;
• and
• a fuel pressure sensor that is attached on the outer peripheral surface of the main body and configured to detect pressure of high pressure fuel, wherein:
• the supply port and the sensor are diametrically opposed to each other;
• the main body further includes a sensor passage, which branches from the high pressure passage in such a manner as to extend from the fuel downstream end portion of the first passage in an imaginary extension of the first passage so that high pressure fuel flows into the sensor through the sensor passage;
• and
• an end surface of the main body on an opposite side of the main body from the injection hole in an axial direction of the main body includes a discharge port, through which a surplus of high pressure fuel is discharged.