In mountainous areas, unreinforced concrete wall is a commonly used building way for new constructions. Actually this technique offers a suitable strength in case of construction in a slope. In these areas prone to rockfall hazard, the vulnerability of constructions to this hazard has to be considered. Even if numerous studies on the impact strength of concrete wall exist, they addressed either a quite different type of impact loading from rockfall impact (vehicle impact : Miyamoto & King, 1994; projectile impact: Smith & Cusatis, 2016) or a specifically reinforced concrete wall against rockfall (Mougin et al, 2005; Bertrand et al, 2015). To evaluate the strength of unreinforced concrete wall to rockfall impact, an experimental study was performed and some parts of the results are presented in this paper.