  It is known that the simply evaluated value of the zero point energy of
quantum fields is extremely deviated from the observed value of dark energy
density. In this paper, we consider whether the Casimir energy, which is the
zero point energy brought from boundary conditions, can cause the accelerating
expansion of the Universe by using proper renormalization method and
introducing the fermions of finite temperature living in $3+n+1$ space-time. We
show that the zero temperature Casimir energy and the finite temperature
corrections can explain the current accelerated expansion of the Universe.
