  In this article, we derive the finite temperature Casimir force acting on a
pair of parallel plates due to a massless scalar field propagating in the bulk
of a higher dimensional brane model. In contrast to previous works which used
approximations for the effective masses in deriving the Casimir force, the
formulas of the Casimir force we derive are exact formulas. Our results
disprove the speculations that existence of the warped extra dimension can
change the sign of the Casimir force, be it at zero or any finite temperature.
