  We show the universal seesaw in the extra dimension setup, where three extra
vector-like fields exist in the 5D bulk with heavy masses. We take the
framework of the left-right symmetric model. The universal seesaw formula is
easily obtained as a replacement of the vector-like mass in 4D case M_i to
  2 M_* tan[pi RM_i] (M_*: 5D Planck scale,
  M_i: vector-like bulk mass, and
  R: compactification radius). The smallness of Dirac neutrino mass can be
naturally explained in the 5D setup. We also show the Majorana neutrino case.
