Ignition device-integrated injector, internal combustion engine, gas burner, and ignition device

[Problem] To provide an ignition device-integrated injector in which a fuel injection device can be made compact in its entirety without making major changes to the structure thereof. [Solution] This invention is configured from: an ignition device 3 that boosts electromagnetic waves oscillated from an electromagnetic wave oscillator MW by means of a boosting means formed by a resonance structure, and increases the potential difference between a ground-contact electrode 51 and an electrical discharge electrode 31, causing an electrical discharge; and a fuel injection device 2 that controls the injection of fuel by a valve body part of a nozzle needle 24 being brought into contact with and separated from a valve seat (orifice) 23a. Additionally, the resonance structure is configured between a dielectric 30 formed on the surface of a fuel injection pipe 21 and connected to the electromagnetic wave oscillator, and an inner wall surface 50a of an installation opening 50 for an injector in a cylinder head 5. The electrical discharge electrode 31 is a protruding part formed on the surface of the fuel injection pipe 21, and electrical discharge is generated, having the part of the wall surface of the installation opening 50 closest to the electrical discharge electrode 31 serve as the ground-contact electrode 51.