A fuel nozzle, comprising: an internal cylinder; a burner cylinder (2,7) concentrically provided on an outer circumference of the internal cylinder in the vicinity of a distal end thereof to surround a distal end portion of the internal cylinder; an air passage (4,7) provided between the burner cylinder (2,7) and the internal cylinder for delivering combustion air; a space provided at an axial center of the internal cylinder and extending in an axial direction of the internal cylinder; a plurality of inner passages provided at approximately equal intervals in a circumferential direction of the internal cylinder for injecting fluid through a distal end portion; and at least one communication portion provided on an upstream side of the distal end portion of the internal cylinder and extending from an outer wall of the internal cylinder toward an inner side in a radial direction to communicate with the space, such that part of the combustion air passing through the air passage (4,7) is delivered, in operation, into the space through the communication portion and is discharged from a distal end portion of the space, characterized in that the fuel nozzle comprises a circular return combustion air passage provided in the internal cylinder to be sandwiched between the inner passages and the space and extending in the axial direction of the internal cylinder; and a plurality of connection portions connecting the return combustion air passage and the air passage (4,7), wherein a porous plate with a plurality of holes communicating with the space is provided at a distal end of the space and a blocker closing the return combustion air passage is provided at a distal end of the return combustion air passage, such that the combustion air passing through the space is discharged through the porous plate to impinge against the blocker, and then is delivered into the return combustion air passage, and the combustion air delivered into the return combustion air passage is delivered into the air passage through the connection portions. an internal cylinder; a burner cylinder (2,7) concentrically provided on an outer circumference of the internal cylinder in the vicinity of a distal end thereof to surround a distal end portion of the internal cylinder; an air passage (4,7) provided between the burner cylinder (2,7) and the internal cylinder for delivering combustion air; a space provided at an axial center of the internal cylinder and extending in an axial direction of the internal cylinder; a plurality of inner passages provided at approximately equal intervals in a circumferential direction of the internal cylinder for injecting fluid through a distal end portion; and at least one communication portion provided on an upstream side of the distal end portion of the internal cylinder and extending from an outer wall of the internal cylinder toward an inner side in a radial direction to communicate with the space, such that part of the combustion air passing through the air passage (4,7) is delivered, in operation, into the space through the communication portion and is discharged from a distal end portion of the space, characterized in that the fuel nozzle comprises a circular return combustion air passage provided in the internal cylinder to be sandwiched between the inner passages and the space and extending in the axial direction of the internal cylinder; and a plurality of connection portions connecting the return combustion air passage and the air passage (4,7),