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We examine $W$ and $Z$ boson pair production processes at electron-positroncollider experiments in the $SU(3)_C\times SO(5)_W\times U(1)_X$ gauge-Higgsunification (GHU) model. We find that the deviation of the total cross sectionfor the $e^-e^+\to W^-W^+$ process from the Standard Model (SM) in the GHUmodel with parameter sets, which are consistent with the current experiments,is about 0.5% to 1.5% and 0.6% to 2.2% for $\sqrt{s}=250$GeV and 500GeV,respectively, depending on the initial electron and positron polarization. Wefind that for the $e^-e^+\to ZZ$ process the deviation from the SM in the GHUmodel is at most 1%. We find that unitality bound for the $e^-e^+\to W^-W^+$process is satisfied in the GHU model as in the SM, as a consequence of therelationship among coupling constants.

$W$ and $Z$ Boson Pair Production at Electron-Positron Colliders in Gauge-Higgs Unification