To provide an oxygen burner capable of obtaining low luminous or non-luminous flame of large length without producing soot and preventing carbon from adhering on a nozzle portion.

The oxygen burner having a triple tubular structure comprises a primary oxygen channel 16 provided in a center tube 11, a fuel gas channel 15 provided between the center tube 11 and an inner tube 12, and a secondary oxygen channel 16 provided between the inner tube 12 and an outer tube 13. The end of the inner tube 12 is stuck out forward of the end of the center tube 11, so that fuel gas jetted out from a fuel gas nozzle 18, which is formed between the outer periphery of the center tube end and the inner periphery of the inner tube, is directed to a focal point F1 on the axis of the center tube 11. Further, the end of the outer tube 13 is stuck out forward of the end of the inner tube 12, so that secondary oxygen jetted out from a secondary oxygen nozzle 19, which is formed between the outer periphery of the inner tube end and the inner periphery of the outer tube, is directed to a focal point F2 on the axis of the center tube.