  We propose a mechanism of Higgsless gauge symmetry breaking with a large mass
hierarchy. We consider a 5D gauge theory on an orbifold $S^1/Z_2$. The gauge
symmetry is broken by orbifolding and also nontrivial boundary conditions at
fixed points. All 4D modes which survive at low energies are found to be
localized around fixed points. Supersymmetry plays an important role in our
mechanism. The tree-level unitarity in our model is briefly discussed.
