We apply the gauge theory on the M-4 x Z(2) geometry previously propos
ed by Konisi and Saito to the Weinberg-Salam model for electroweak int
eractions, especially in order to clarify the geometrical meaning of t
he curvatures in this geometry. Considering the Higgs field to be a ga
uge field along the Z(2) direction, we also discuss the BRST-invariant
guage fixing in this theory.