Production process and the carbon nanotube carbon nanotube manufacturing apparatus

Method for producing a carbon nanotube of the present invention uses the carbon source is decomposed in a heated state contains carbon, a catalyst which is a catalyst for producing carbon nanotubes from carbon source, and in the reactor a arranged carbon nanotube production method of synthesizing the carbon nanotubes on the support of the heating condition, the catalyst on the support by circulating the catalyst material as a raw material for the catalyst on the support a catalyst supporting step of supporting, the carbon source that is circulated on the support, a synthesis step of synthesizing the carbon nanotubes on the support, by circulating the separated gas stream on said support , anda separating step of separating the carbon nanotubes from the support, wherein the catalyst loading step, the synthesis step, and the separation step, said support While maintaining the heated state, the catalyst material, the carbon source, and a method which is characterized in that while switching the separation gas stream.