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The main result of the present paper consists in a quantitative estimate ofunique continuation at the boundary for solutions to the wave equation. Suchestimate is the sharp quantitative counterpart of the following strong uniquecontinuation property: let $u$ be a solution to the wave equation thatsatisfies an homogeneous Robin condition on a portion $S$ of the boundary andthe restriction of $u_{\mid S}$ on $S$ is flat on a segment $\{0\}\times J$with $0\in S$ then $u_{\mid S}$ vanishes in a neighborhood of $\{0\}\times J$.

Wave equation with Robin condition, quantitative estimates of strong unique continuation at the boundary