Burner, combustor provided with same, and gas turbine provided with combustor

A burner comprising:

• a mixing pipe that extends in a predetermined extending direction and in which a mixing space for mixing air and fuel is formed;
• and
• a fuel nozzle that extends in the extending direction and of which at least a part is disposed in the mixing space,
• wherein the mixing pipe has an air inlet through which the air can flow into the mixing space, and an ejection port through which a premixed gas in which the air and the fuel are mixed can be ejected from the mixing space,
• the ejection port is formed at an end of the mixing pipe on a downstream side, out of an upstream side which is one side in the extending direction and the downstream side which is the other side of the extending direction,
• the fuel nozzle has a nozzle main body that extends in the extending direction, and a protrusion portion that protrudes from an outer peripheral surface of the nozzle main body and is separated from an inner peripheral surface of the mixing pipe,
• the nozzle main body has a fuel ejection port that can eject the fuel into the mixing space from a position which is on the downstream side of the air inlet and on the upstream side of the ejection port, and
• the protrusion portion gradually extends to the downstream side as the protrusion portion extends in a circumferential direction with reference to the nozzle main body, and an entire portion of the protrusion portion is formed in a spiral shape around the nozzle main body.