To provide a technique capable of suppressing exhaustion of unburned components even in low combustion load operation in a burner apparatus including a plurality of combustion flow passages A1, A2 in which burner apparatus a fuel G is supplied to air A flowing therein, and mixed gas is supplied to a combustion section 15 for combustion.

Supply sections 5, 7 are provided on combustion flow passages A1, A2 for supplying a fuel respectively, and part of a fuel G supplied from a supply section 7 to the one combustion flow passage A2 is received only when a flow rate of the fuel from the supply section 7 is more than a predetermined critical flow rate. A supply passage 6 for supplying the fuel to a supply section of the next stage combustion flow passage A1 is provided between the combustion flow passages A1, A2, and combustion load adjustment means 20 is provided for adjusting the total supply flow rate of the fuel G such that the flow rate of the fuel G from the supply section 7 falls within a region including the predetermined critical flow rate.