To provide a fuel gas burner having widened utilization range in which high temperature combustion flame can be formed stably.

The burner comprise a combination of a fuel gas ejection nozzle 2 communicating with a fuel gas introduction pipe 1 and a burner body 3 to be engaged with the nozzle 2 and having suction hole 3a for mixing combustion air through Venturi action at the time of ejection fluidity of fuel gas wherein the burner body 3 is provided with a combustion cover 5 covering an opening 4 obliquely to form a sectoral flattened combustion flame through collision of mixture gas ejected from the opening 4.