A burner, comprising: an inner gas nozzle which extends along an axis while surrounding the axis, and which is configured to supply a furnace with an inner combustion oxygen containing gas; a fuel supply nozzle surrounding the inner gas nozzle as seen in a direction along the axis, the fuel supply nozzle configured to supply the furnace with a fluid mixture of a solid powder fuel and a carrier gas; an outer gas nozzle surrounding the fuel supply nozzle as seen in the direction along the axis, the outer gas nozzle configured to supply the furnace with an outer combustion oxygen containing gas; an inner flame holder disposed on an outlet section of the inner gas nozzle and comprising a plate-shaped member extending inward from a periphery of the outlet section of the inner gas nozzle so as to contract a flow of the inner combustion oxygen containing gas; an outer flame holder disposed on an outlet section of the outer gas nozzle and configured to deviate a flow of the outer combustion oxygen containing gas from the axis; a flow-velocity-ratio adjustment apparatus configured to adjust a relative flow velocity ratio of a discharge flow velocity (Fc) of the inner combustion oxygen containing gas to a discharge flow velocity (Fo) of the outer combustion oxygen containing gas; a plurality of intermediate flame holders extending between the outlet section of the inner gas nozzle and the outlet section of the outer gas nozzle so as to intersect an outlet section of the fuel supply nozzle, characterized in that the flow-velocity-ratio adjustment apparatus is configured such that the discharge flow velocity of the inner combustion oxygen containing gas is higher than the discharge flow velocity of the outer combustion oxygen containing gas. an inner gas nozzle which extends along an axis while surrounding the axis, and which is configured to supply a furnace with an inner combustion oxygen containing gas; a fuel supply nozzle surrounding the inner gas nozzle as seen in a direction along the axis, the fuel supply nozzle configured to supply the furnace with a fluid mixture of a solid powder fuel and a carrier gas; an outer gas nozzle surrounding the fuel supply nozzle as seen in the direction along the axis, the outer gas nozzle configured to supply the furnace with an outer combustion oxygen containing gas; an inner flame holder disposed on an outlet section of the inner gas nozzle and comprising a plate-shaped member extending inward from a periphery of the outlet section of the inner gas nozzle so as to contract a flow of the inner combustion oxygen containing gas; an outer flame holder disposed on an outlet section of the outer gas nozzle and configured to deviate a flow of the outer combustion oxygen containing gas from the axis; a flow-velocity-ratio adjustment apparatus configured to adjust a relative flow velocity ratio of a discharge flow velocity (Fc) of the inner combustion oxygen containing gas to a discharge flow velocity (Fo) of the outer combustion oxygen containing gas; a plurality of intermediate flame holders extending between the outlet section of the inner gas nozzle and the outlet section of the outer gas nozzle so as to intersect an outlet section of the fuel supply nozzle, characterized in that the flow-velocity-ratio adjustment apparatus is configured such that the discharge flow velocity of the inner combustion oxygen containing gas is higher than the discharge flow velocity of the outer combustion oxygen containing gas.