PURPOSE: To realize a remarkable improvement, in the number of working days needed for changing fire-proof bricks or the like and an improvement of working environment in a burner device.

CONSTITUTION: A burner is constituted by deviding into two parts, a combustion part 2 and a fuel air inroduction part 3. The combustion part 2 is made of ceramics and a ceramic rising part 4 is formed in the radial direction at a rear end of the combustion part 2. At a tip end of the fuel air introduction part 3, a connection flange part, 5 is provided to sandwich the ceramic rising part 4, so that the combustion part 2 and the fuel air introduction part 3 can be connected as desired. By this, when fire-proof bricks or the like are changed, any work within a furnace is not needed at all, and therefore, working environment can be improved remarkably. In addition, it is not necessary to stop a furnace body, and further, the changing work can be done while the temperature in the furnace is being raised up. All this can contribute to a reduction of cost.