To provide a device for accelerating decomposition of fuel, which forms magnetized gas, is useful for accurate and efficient fusion of material by combustion by accelerating decomposition of gas and fuel during combustion, contributes to make exhaust gas pollution free, and also contribute to energy saving and reduction of the pollution which is a problem a contemporary society has, and rises as economy grows.

In claim 1, magnetized gas is sent into a combustion chamber, accurate fusion of material is accelerated, and efficient combustion is executed to approach low fuel consumption and pollution free exhaust gas. In claim 2, magnetized gas is sent into exhaust gas after combustion, accurate fusion of material is accelerated to provide pollution free exhaust gas.