  The theory that the extra-space component of the gauge field is identified
with the standard model Higgs boson, is called the gauge-Higgs unification
(GHU) scenario. We examine how the small neutrino masses are naturally
generated in the GHU framework. We find out two model classes where the
following matter multiplets are introduced : 1. adjoint rep. lepton $\Psi_{A}$,
2. fundamental rep. lepton $\Psi_{F}$ and scalar $\Sigma_{F}$. We present a
concrete model in each class. At the model in class 1, the neutrino masses are
generated by the admixture of the seesaw mechanism type-I and -III. At the
model in class 2, the masses are generated by the inverse seesaw mechanism.
