The National Diet Building (Kokkai-gijidō) is the place where both houses of the Diet of Japan meet. It is located at 1-chome, Nagatachō, Chiyoda, Tokyo. The Diet Building was completed in 1936 and is constructed purely out of Japanese building materials, with the exception of the stained glass, door locks, and pneumatic tube system.
The construction of the building for the old Imperial Diet began in 1920; however, plans for the building date back to the late 1880s. The Diet met in temporary structures for the first fifty years of its existence because there was no agreement over what form its building should take.