NOVELTY - A coaxial-type vacuum arc vapor deposition apparatus (1) is used for manufacturing nanoparticles. The front portion of cylindrical cathode electrode (15a) of the coaxial-type vacuum arc vapor deposition apparatus contains metal material for nanoparticles preparation. A trigger discharge is generated between trigger electrode (15c) and anode electrode (15b). An arc discharge is induced between cathode and anode. The metal material particles and raw material fine particles (S) are adhered, to obtain nanoparticles. Thus, manufacture of nanoparticles is carried out.    USE - Manufacture of nanoparticles used for fuel cell catalyst (claimed) and as catalyst layer of carbon nanotubes.    ADVANTAGE - The manufacture method provides nanoparticles with uniform size. The fuel cell catalyst comprising the nanoparticles has excellent electrical property.    DETAILED DESCRIPTION - A coaxial-type vacuum arc vapor deposition apparatus is used for manufacturing nanoparticles. The coaxial-type vacuum arc vapor deposition apparatus contains cylindrical trigger electrode, cylindrical cathode electrode, disk-shaped insulation insulator (15d), coaxial-type vacuum arc deposition source (15) and cylindrical anode electrode. The front portion of the cylindrical cathode electrode contains metal material for nanoparticles preparation. The cylindrical anode electrode is coaxially arranged around the cathode electrode and the trigger electrode. A trigger discharge is generated in pulse between the trigger electrode and the anode electrode. An arc discharge is induced between the cathode electrode and the anode electrode. The metal material particles and raw material fine particles are adhered, to obtain nanoparticles. The metal material particles used for manufacture has particle size in nanometers. Thus, manufacture of nanoparticles is carried out.    DESCRIPTION OF DRAWING(S) - The drawing shows the block diagram of the coaxial-type vacuum arc vapor deposition apparatus.    Coaxial-type vacuum arc vapor deposition apparatus (1)    Coaxial-type vacuum arc vapor source (15)    Cathode electrode (15a)    Anode electrode (15b)    Trigger electrode (15c)    Insulation insulator (15d)    Capacitor (15h)    Raw material fine particles (S)