Iriomote Island of Okinawa lies south-west of Japan and the climate is subtropic-oceanic. To obtain basic information on the main dietary-life conditions of people in this district, the authors have conducted a nutritive investigation of the people engaged in rice crop production, during 1969 and 1970. As a result of this investigation in which a low average blood pressure and salt intake was generally seen, we examined the relation between the blood pressure and the consumption of sodium and other several kinds of foods. In this investigation adults-males and females older than twenty, of two communities of Iriomoto Island were chosen as subjects. The results were as follows: The blood pressure had a tendency to be lower than the average of the National Nutrition Survey, though no statiscal difference was found, especially with people over the age of fourty. The salt consumption was lower than that reported in the Farmer's Nutrition Survey. This was remarkable in the population under fourty. The consumption of polished rice was not larger than the average level reported in the National Nutrition Survey, but the consumption of sugar and fat tended to be larger. Though the purpose of this Survey was to study the relation between blood pressure and salt consumption, adding the age-factor, we could not find any special correlation. There was no correlation in either blood pressure, and the intake of sugar, vegetable oil and eggs.