  The generalized covariant derivative on 5-dimen-sional space including
1-dimensional extra compact space is defined, and, by use of it, the
Weinberg-Salam model is reconstructed. The spontaneous breakdown of symmetry
takes place owing to the extra dimension under the settings that the Higgs
field exists in the extra dimensional space depending on the argument $y$ of
this extra space, whereas the gauge and fermion fields do not depend on $y$.
Both Yang-Mills-Higgs and fermion Lagrangians in Weinberg-Salam model are
correctly reproduced.
