To provide miniaturizable and low-cost regenerative alternate combustion system, by reducing the number of motors.

In this regenerative alternate combustion system, a pair of burners 2a, 2b provided with regenerative heat exchangers 3a, 3b are alternately used for combustion, and the waste heat is recovered by the other regenerative heat exchanger during the combustion of one of the burners. An air supply blower 5 for sending the air to supply the air for combustion to the burners 2a, 2b and an air discharge fan 7 for sending air to discharge the combusted exhaust gas, are driven by one motor 8.