  The signals of the SO(5) \times U(1) gauge-Higgs unification model at the
International Linear Collider are studied. In this model, Kaluza-Klein modes of
the neutral gauge bosons affect fermion pair productions. The deviations of the
forward-backward asymmetries of the $e^+e^-\to \bar{b}b$, $\bar{t}t$ processes
from the standard model predictions are clearly seen by using polarised beams.
The deviations of these values are predicted for two cases, the bulk mass
parameters of quarks are positive and negative case.
