  Recently various phenomenological implications of the existence of extra
space-time dimensions have been investigated. In this letter, we construct a
model with realistic fermion mass hierarchy with (large) extra dimensions
beyond the usual four dimensions. In this model, it is assumed that some matter
fields live in the bulk and the others are confined on our four dimensional
wall. It can naturally reproduce the quark and lepton mass hierarchy and mixing
angles without any symmetry arguments. We also discuss some possibilities of
obtaining suitable neutrino masses and mixings for the solar and atmospheric
neutrino problems.
