Habitat quality in the area occupied by the brown bear (Ursus arctos) eastern population in Cantabrican Mountains was assessed, based on radio-tracking locations and bear signs. Distance to the nearest village and distance to the nearest paved road were included among explanatory variables. Results showed that the area permanently occupied by brown bears (suitable habitat) had less than half the density of roads found in secondary habitat. Unhabited area had a even higher road density. Roads probably do not prevent bears from occurring in an area, but they certainly increase the risk of deliberate or accidental killing of bears by humans. Palabras clave: Bear, Disturbance, Habitat, Highway, Mortality, Population