The vestibular function in cerebral palsy children is hardly known; the author examined 40 children between 2 and 20 years of age. All the examinations were made by electronystagmography with the pendular armchair of Greiner and partly by the thermic method; in 17 cases the response were normal and symmetrical, in 3 cases peripheric anomalies (unilateral hyporeflexy) could be shown, the other children being characterized by central alterations. These phenomena could let one think that deafness, too, in cerebral palsy children is often of central etiology.