Abstract: An apparatus and a method of producing a vapor-grown carbon structure capable of obtaining a vapor-grown carbon structure with a markedly low production cost are provided. A vapor-grown carbon structure producing apparatus 1 has a screw feeder 4 for supplying a biomass raw material into a furnace 2, a thermal decomposition zone 5 having a first high-temperature air introducing nozzle 6 for thermally decomposing the supplied raw material at a thermal decomposition temperature of 500 to 900° C., a combustion zone 7 having a second high-temperature air introducing nozzle 8 for combusting a thermal decomposition product at a reaction temperature of 900 to 1300° C., and a charbed zone 9 for holding a combustion residue having passed through the combustion zone 7 and generating a carbon radical in a decomposition gas, to generate a vapor-grown carbon structure.