Provided is a top-firing hot blast stove that is provided with a burner and a burner duct that enable an ignition point to be stabilized at a desired position in a burner duct and that eliminate the occurrence of flickering and have high combustion efficiency. The top-firing hot blast (10) stove comprises a regenerator (4) and a combustion chamber (3) provided with a burner system and disposed above the regenerator (4). The burner system comprises: a burner (1) provided with fuel gas lines (1c) and air lines (1b, 1d) for fuel use; and a burner duct (2) that communicates with the burner (1) and a burner outlet (1a). The burner duct (2) communicates with a combustion chamber (3) via a burner duct outlet (2b). From a mid-point in the burner duct (2) up to the burner duct outlet (2b), an expandable diameter part (2c) is provided where the diameter (D1) of the burner duct (2) is made larger. A vortex current (ED) of a mixed gas (MG) that flows in the burner duct (2) towards the combustion chamber (3) is formed by the expandable diameter part (2c).
