From Ford Wiki
Hiroshima Plant is an Automobile manufacturing complex in Aki District, Hiroshima and Ujina District, Hiroshima, Hiroshima Prefecture, Japan operated by Mazda Motor Corporation. The complex consists of two main elements, the head office in Aki District, Hiroshima, and the main plant in nearby Ujina District, Hiroshima. It was Mazda's only car-assembly plant in Japan until the Hofu Plant opened in 1982.
The head office opened March, 1931, and continues to serve as a site for Piston engine and Transmission (mechanics) production. The head office is 551,000 square meters - or about 5,930,000 square feet (551,000 m2) - in size.
The plant complex includes Plants I and II (officially "U1" and "U2" for their Ujina location). The total complex is 1.69 million square meters - or about 18,191,000 square feet (1,690,000 m2) - in size.
Ujina 1 opened in November, 1966.
Ujina 2's engine plant opened in December, 1964, with the current automobile assembly plant opening in December, 1972.