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The observatory\u0027s history can be divided into three stages, i.e., 1970-1980, 1981-1987, and 1988 to present. In the first stage, geomagnetic total intensity and three component variations were recorded in a digital form by a printer, as well as monitor recordings on strip charts. In 1981, a cassette tape recording system was introduced, which was improved to a telemetry system in 1984. The present system, since 1988, consists of a proton precession magnetometer, an Overhauser magnetometer, two three-component fluxgate variometers, with a telemetry system and a backup power supply. The observatory also has five satellite magnetic stations in the Tokai district to study the regional characteristics of the geomagnetic secular variations. 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