  Masses of the three generations of charged leptons are known to completely
satisfy the Koide's mass relation. But the question remains if such a relation
exists for neutrinos? In this paper, by considering SeeSaw mechanism as the
mechanism generating tiny neutrino masses, we show how neutrinos satisfy the
Koide's mass relation, on the basis of which we systematically give exact
values of not only left but also right handed neutrino masses.
