Large Gauge Hierarchy in Gauge-Higgs Unification

We study a five dimensional nonsupersymmetric SU(3) gauge theory compactified on $M^4\times S^1\mathrm{/}{Z}_2$. The gauge hierarchy is discussed in the scenario of the gauge-Higgs unification. We present two models in which the large gauge hierarchy is realized, that is, the weak scale is naturally is obtained from an unique large scale such as a GUT and the Planck scale. We also study the Higgs mass in each model.