[Problem] To provide an ignition system for a compact internal combustion engine, which does not require a complex system or a spark plug which discharges a high voltage, and which, by using only electromagnetic waves, can efficiently generate, expand and ...

An ignition system of an internal combustion engine comprising ignition electrodes positioned in a bottom part of the engine head, characterized in that the ignition electrodes (2, 3) are mounted on a periphery of a combustion chamber (4) in head cavities ...