To provide a method for manufacturing a nitrogen-doped single-walled carbon nanotube.

The method for manufacturing a nitrogen-doped single-walled carbon nanotube comprises the steps of: forming a catalyst metal layer on a substrate; mounting the substrate having the catalyst metal layer formed thereon in a reaction chamber; forming an H2O plasma atmosphere in the reaction chamber; supplying a carbon precursor and a nitrogen precursor into the reaction chamber to chemically react the carbon precursor and the nitrogen precursor under the H2O plasma atmosphere and thereby growing a nitrogen-doped carbon nanotube on the catalyst metal layer.