The diagnosis was investigated in 1,339 patients, who had visited the Department of Neurotology in Kitasato University East Hospital (KUEH) during a recent18 month period from July 2014 to December 2015. The patients in our department were classified into 5 groups by diagnosis; peripheral vestibular disorders (51.2%), diseases of the central nervous system (1.4%), generalized disorders (3.8%), diagnosis from symptom (41.7%), and unknown (1.9%). The number of the patients suffering from Meniere's disease, who had been treated with our original therapy, increased remarkably. On the other hand, diseases of the central nervous system decreased. Although generalized disorders showed no change, psychogenic vertigo increased. Under the legacy system in Kitasato University Hospital (KUH), it took a long time for patients to visit the neurotological clinic from the otorhinolaryngological clinic and impaired early treatment. Openning our department enabled early treatment. This is a merit. On the other hand, it was difficult for patients to consult the Departments of Neurology, Neurosurgery or Emergency and Critical Care Medicine that treat diseases of the central nervous system, because they are in KUH which is distant from KUEH. This is a demerit. Therefore, we found both merits and demerits of our department based on the results of this investigation.