To provide a gas burner for industrial use enabling uniform heating by forming a flame homogeneous all around the burner port.

An annular mixing chamber 7 is provided between a burner base 1 and a burner cap 2, a mixing tube 3 for mixing fuel and primary air is connected to the bottom surface of the chamber 7 so that the tube 3 faces the tangent direction relative to the chamber 7, and burner ports 8 are arrayed all around the cap 2. The burner diameter is 100 mm or more and the maximum heating power is 25,000 kJ/h (6,000 kcal/h) or more. For straightening the gas flow running to the ports 8 to be uniform, a straightening board 10 is provided, which hangs down from the top face of the chamber 7. A turbulence board 11 is provided in the chamber 7, which disturbs the gas flow circumventing in the chamber 7.