  The gauge-Higgs unification theory identifies the zero mode of the extra
dimensional component of the gauge field as the usual Higgs doublet. Since this
degree of freedom is the Wilson line phase, the Higgs does not have the mass
term nor quartic coupling at the tree level. Through quantum corrections, the
Higgs can take a vacuum expectation value, and its mass is induced. The
radiatively induced mass tends to be small, although it can be lifted to
${\mathcal O}(100)$ GeV by introducing the ${\mathcal O}(10)$ numbers of bulk
fields. Perturbation theory becomes unreliable when a large number of bulk
fields are introduced. We reanalyze the Higgs mass based on useful expansion
formulae for the effective potential and find that even a small number of bulk
field can have the suitable heavy Higgs mass. We show that a small (large)
number of bulk fields are enough (needed) when the SUSY breaking mass is large
(small). We also study the case of introducing the soft SUSY breaking scalar
masses in addition to the Scherk-Schwarz SUSY breaking and obtain the heavy
Higgs mass due to the effect of the scalar mass.
