Patent ID: 8528531

Claim:
An ignition apparatus of a plasma jet ignition plug, comprising: a plasma jet ignition plug including an insulator having an axis hole that extends in an axial direction and a center electrode in the axis hole, a metal shell having a cylindrical shape and holding the insulator, and a ground electrode having a plate shape and having a communication hole that communicates along the axial direction in its center; a discharge voltage application unit applying a voltage for providing a spark discharge in a spark discharge gap, which is formed between the center electrode and the ground electrode, to the plasma jet ignition plug; and a diode disposed between the plasma jet ignition plug and the discharge voltage application unit; wherein the ignition apparatus further includes: a resistor, wherein one end of the resistor is connected to the diode and the other end of the resistor is electrically connected to the center electrode of the plasma jet ignition plug; and a capacitor functional component, wherein one end of the capacitor functional component is electrically connected to the center electrode of the plasma jet ignition plug and the other end of the capacitor functional component is grounded, said capacitor functional component including: a terminal fitting electrically connected to the center electrode of the plasma jet ignition plug, and a metal cask having a hollow cylindrical shape and receiving the terminal fitting in an inside of the metal cask.