Though there are many studies of cerebrovascular accidents from etiological point of view, few have been reported concerning impacts of daily life to cerebrovascular accidents from the view point of public health. The author examined the interactions between human factors and his environment in the cases of cerebrovascular accidents in two areas and one group of workers. The 227 objects were selected to discuss from the patients and the dead in two rural areas by examining answeres to questionnaires, medical records by doctors, and dath certificates. The results are as follows. 1) There was a difference of incidence of cerebrovascular accidents between those two areas it was 4.35 per 1,000 adults over 40 years in Kayo, whereas 6.20 in Yao. 2) Cerebrovascular accidents often occurred at either dinning and bath room in the evening or toilet in the midnight. 3) The impacts of climate was not clear in Yao where the climate is calm, on the conrary there were observed two peaks of incidence in summer and winter in Kayo where the climate is sever. 4) There were found more frequently cerebral hemorrahge than cerebral thrombosis among male farmers in those two areas. 5) The author pointed out that not only natural impacts but also soci-economical and cultural background to cerebrovascular accidents must be discussed, such as organization of labour and so forth. 6) There were observed the evidence that chronic CS(2) exposure resulted in high incidence of hypetention and cerebrovascular accidents.