  We discuss hadronic EDM constraints on the neutrino sector in the SUSY SU(5)
GUT with the right-handed neutrinos. The hadronic EDMs are sensitive to the
right-handed down-type squark mixings, especially between the second and third
generations and between the first and third ones, compared with the other
low-energy observables, and the flavor mixings are induced by the neutrino
Yukawa interaction. The current experimental bound of the neutron EDM may imply
that the right-handed tau neutrino mass is smaller than about 10^{14} GeV in
the minimal supergravity scenario, and it may be improved furthermore in future
experiments, such as the deuteron EDM measurement.
