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Let $F$ be a $p$-adic field and let $G$ be a connected reductive groupdefined over $F$. We assume $p$ is big. Denote $\mathfrak{g}$ the Lie algebraof $G$. To each vertex $s$ of the reduced Bruhat-Tits' building of $G$, weassociate as usual a reductive Lie algebra $\mathfrak{g}_{s}$ defined over theresidual field ${\mathbb F}_{q}$. We normalize suitably a Fourier-transform$f\mapsto \hat{f}$ on $C_{c}^{\infty}(\mathfrak{g}(F))$. We study the subspaceof functions $f\in C_{c}^{\infty}(\mathfrak{g}(F))$ such that the orbitalintegrals of $f$ and of $\hat{f}$ are $0$ for each element of $\mathfrak{g}(F)$ which is not topologically nilpotent. This space is related tothe characteristic functions of the character-sheaves on the spaces$\mathfrak{g}_{s}({\mathbb F}_{q})$, for each vertex $s$, which are cuspidaland with nilpotent support. We prove that our subspace behave well underendoscopy.

Fonctions dont les int\'egrales orbitales et celles de leurs transform\'ees de Fourier sont \`a support topologiquement nilpotent