  Let G be a special orthogonal group SO(2n+1) defined over a p-adic field F.
Let $\pi$ be an admissible irreducible representation of G(F) which is tempered
and of unipotent reduction. We prove that $\pi$ has a wave front set. In some
particular cases, for instance if $\pi$ is of the discrete series, we give a
method to compute this wave front set.
