An exhaust gas purifying device for burning the unburnt component contained in the exhaust gas of an internal combustion engine. A swirl of air is formed in a combustion chamber, fuel is supplied into the combustion chamber and burnt, and a combustion flame swirling in the combustion chamber is blown into a reaction chamber disposed in an exhaust pipe of the internal combustion engine. A porous member made of noncombustible material is mounted to an opening of a fuel spouting pipe opened into the combustion chamber.