日本原子力研究開発機構
is a village located in Ibaraki Prefecture, Japan. , the village had an estimated population of 37,651 in 15,148 households and a population density of 991 persons per km2. The percentage of the population aged over 65 was 25.8%. The total area of the village is . The Japan Atomic Energy Agency along with other organizations currently operate a number of nuclear technology research facilities in the town. In particular, Tōkai Nuclear Power Plant is located in Tōkai.