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Based on an assumption that an S_4 flavor symmetry is embedded into SU(3), alepton mass matrix model is investigated. A Frogatt-Nielsen type model isassumed, and the flavor structures of the masses and mixing are caused by VEVsof SU(2)_L-singlet scalars \phi_u and \phi_d which are nonets (8+1) of theSU(3) flavor symmetry, and which are broken into 2+3+3' and 1 of S_4. If werequire the invariance under the transformation (\phi^{(8)},\phi^{(1)}) \to(-\phi^{(8)},+\phi^{(1)}) for the superpotential of the nonet field\phi^{(8+1)}, the model leads to a beautiful relation for the charged leptonmasses. The observed tribimaximal neutrino mixing is understood by assuming twoSU(3) singlet right-handed neutrinos \nu_R^{(\pm)} and an SU(3) triplet scalar\chi.

S_4 Flavor Symmetry Embedded into SU(3) and Lepton Masses and Mixing