To classify the superfine particles of nm level by excellent resolvality in a disk type superfine particles classifying device.

A conventional disk type superfine particles classifying device using kinetic movement (gravity) is improved to a superfine particles classifying device using electric mobility. Moreover, a classifying area is improved from one stage to multistage. Applied direct voltage, a kind and a flow rate of sheath gas and a flow rate of carrier gas are made settable in every classifying area so that the classification resolvality is enhanced as the number of stages in classifying area is in eased.