To simplify the construction of a combination burner and to reduce operation costs.

A combination burner includes a scattering means 1 for scattering liquid fuel L and an atomizing gas blowoff port 6 for blowing off atomizing gas X against the scattered liquid fuel L' to atomize the fuel L' to burn the atomized liquid fuel L" and a gas fuel G fed from a gas fuel mixing means M in a mixed state. And a gas fuel feed source S, which can feed the gas fuel G at a pressure high enough to allow the fuel G to be used as the gas X, is provided, while the high pressure gas fuel G fed from the source S, in such a condition that the port 6 can be used as the means M, is blown off from the port 6 as the gas X.