Gait analysis utilizing foot switches and electromyography of antigravity muscles was performed on 31 patients with vertigo. Twenty-one cases had peripheral vestibular lesions (such as vestibular neuronitis, Menière's disease, traumatic labyrinthitis, small acoustic neuroma), and 10 cases had central lesions (such as spinocerebellar degeneration, pontine glioma, cerebellar tumor and giant acoustic neuroma). Parameters employed for analysis included time from heel strike to forefoot strike (HA-I), time from heel off to forefoot off (HA-II) as well as durations of stance, swing and (initial) double supports (DS). Fourteen healthy adults served as controls. The overall incidence of abnormality was highest in HA-I, followed by stance and swing. The occurrence of abnormalities in stance, swing and DS was higher in the central lesion when compared with the group having peripheral lesions. The significance and usefulness of gait analysis for dizzy patients are discussed.