An ignition and chemical reaction accelerator and flame stabilizer and a high-performance speed-type internal combustion engine using this device are provided, whereby ignition and the spreading and holding of flames can be dramatically improved in a gas turbine, a ram machine, a rocket engine, or another speed-type internal combustion engine. An ignition and chemical reaction accelerator and flame stabilizer of a speed-type internal combustion engine comprises a spark plug (110) for preparing charged particles in a predetermined location in a combustor (104) of the speed-type internal combustion engine, and a microwave oscillator (116) and antenna (112) for inducing plasma with a working fluid in the combustor as a starter material by irradiating the charged particles and their surrounding vicinity with microwave pulses; wherein a region in which sufficient conditions for performing combustion are met is formed in the combustor by supplying an active chemical species produced from the working fluid by the effect of the plasma.