The Nippon Budokan , often shortened to simply Budokan, is an indoor arena in Chiyoda, Tokyo, Japan. It was originally built for the inaugural Olympic judo competition in the 1964 Summer Olympics. While its primary purpose is to host martial arts contests, the arena has gained additional fame as one of the world's most outstanding musical performance venues. The Budokan was a popular venue for Japanese professional wrestling for a time, and it has hosted numerous other sporting events, such as the 1967 Women's Volleyball World Championship. Most recently, the arena hosted the Olympic debut of karate in the 2020 Summer Olympics, as well as the judo competition at both the 2020 Summer Olympics and the 2020 Summer Paralympics.

Chiyoda , known as Chiyoda City in English, is a special ward of Tokyo, Japan. Located in the heart of Tokyo's 23 special wards, Chiyoda consists of the Imperial Palace and a surrounding radius of about a kilometer, and is known as the political and financial center of Japan. As of October 2020, the ward has a population of 66,680, and a population density of 5,709 people per km2, making it by far the least populated of the special wards. The total area is 11.66 km2, of which the Imperial Palace, Hibiya Park, National Museum of Modern Art, and Yasukuni Shrine take up approximately 2.6 km2, or 22% of the total area.