PROBLEM TO BE SOLVED: To prevent burnout of a member at a burner outlet due to radiation from a furnace, to prevent attachment of ash, and to keep stability in ignition of a solid fuel and flaming stability without disturbing formation of high-temperature circulation flow at the burner outlet.SOLUTION: A first guide member 34 and a second guide member 35 at the back side of the first guide member of a secondary airflow 17 are disposed on an outlet end part of a nozzle 11 on a partition 29 as an outer peripheral wall of a fuel nozzle 11, the second guide member 35 is held by a plurality of cooling fins 36 evenly disposed over the whole periphery of the nozzle partition 29, and the first guide member 34 allows the secondary airflow 17a, and the secondary airflow 17b guided to a front side of the second guide member 35 from a clearance gap between the second guide member 35 and the partition 29, to flow outward from a central axis of the burner to cool the front side of the second guide member 35 and to prevent attachment of combustion ash, thus the stability in ignition of fuel and flame at the burner outlet is kept.