  Within framework of the $\mu$ from $\nu$ Supersymmetric Standard Model
($\mu\nu$SSM), three exotic right-handed neutrino superfields induce new
sources for lepton-flavor violation. In this work, we investigate muon
conversion to electron in nuclei within the $\mu\nu$SSM in detail. With a 125
GeV Higgs, the numerical results indicate that the $\mu-e$ conversion rates in
nuclei within the $\mu\nu$SSM can reach the experimental upper bound, which
could be detected with the future experimental sensitivities.
