PROBLEM TO BE SOLVED: To provide a multi-stage type cyclone apparatus and a method for classifying and collecting nanoparticles. SOLUTION: The apparatus and the method are provided for classifying and collecting nanoparticles containing various sizes of particulates. A stream containing a plurality of different sizes of particulates passes through at least a first stage cyclone of the multi-stage type cyclone apparatus. The first stage cyclone collects a first particulate group. The stream passes through at least a second stage cyclone of the multi-stage type cyclone apparatus. The second stage cyclone collects a second particulate group. The barometric pressure width of the multi-stage type cyclone apparatus is 20 to 760 torr. The first stage cyclone has a cut-off aerodynamic diameter of d pa 50,1, j , and the second stage cyclone has a cut-off aerodynamic diameter of d pa 50,2, j . The first stage cyclone and the second stage cyclone are connected in series. COPYRIGHT: (C)2008,JPO&INPIT