NOVELTY - A burner (1) comprises nozzle pipe equipped with space part which allows fuel gas and primary air to pass through, burner inner tube (11) in which front-end part is connected with nozzle pipe, air jet nozzles (20) which are provided in wall surface of burner cone and penetrate wall surface, spark plug (21) which forms channel of fuel gas and primary air between outer side and burner inner tube inner side, and burner outer tube (13) positioned on outer side of burner inner tube.    USE - A burner for modifiers (claimed) used for fuel cells.    ADVANTAGE - The burner has simple structure, performs stable combustion without fear of backfire, and is easy to operate.    DETAILED DESCRIPTION - A burner (1) comprises nozzle pipe equipped with space part which allows fuel gas and primary air to pass through, burner inner tube (11) in which front-end part is connected with nozzle pipe, nozzle part which forms cylindrical space in which cross-sectional area of pipe diameter direction reduced with respect to burner inner tube, burner cone of hollow frustum shape in which opening part is largely opened, air jet nozzles (20) which are provided in wall surface of burner cone and penetrate wall surface, spark plug (21) which forms channel of fuel gas and primary air between outer side and burner inner tube inner side, burner outer tube (13) positioned on outer side of burner inner tube, and secondary air channel which passes air jet nozzles which are in between inner side of burner outer tube. The nozzle pipe with which nozzle part serves as ground electrode. The edge part at the side of root with small cross-sectional area of opening part connects with nozzle part opening. The burner cone forms combustion chamber in inner side. The outer sides of burner inner tube, nozzle pipe and burner cone are provided in wall surface of burner cone.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of burner for modifiers.    Burner (1)    Burner inner tube (11)    Burner outer tube (13)    Air jet nozzles (20)    Spark plug (21)