PURPOSE: To eliminate the need for a pressure pump or the like for a fuel oil and reduce the cost of equipment of a gas burner by a method wherein when an oil and a gas are burnt in a multifuel combustion manner, a combustion gas of low pressure is supplied from the center of a gas burner, and a fuel oil from the outer circumferential part of said gas nozzle.

CONSTITUTION: The gas nozzle has a gas nozzle part 2 to which a gas of given pressure is introduced from a passage 4. The gas is passed through said nozzle part 2 and jetted out from a jetting end part 5. A plurality of oil nozzle parts 3 inclining so as to face to the jetting part 5 are provided around the gas nozzle part 2. A fuel oil having a given pressure passes through a plurality of passages 6 in the gas burner, reaches the oil nozzle parts 3, mixes with the gas in the jetting part 5 and then jets out from the jetting part 5 to be burnt. In the combustion method using said gas burner, a city gas, which has a relatively low pressure, or combustible gas such as LPG is employed for accelerating and stabilizing the combustion of a fuel oil. Accordingly, the need for a high-pressure oil pump or the like can be eliminated.