Keio University (慶應義塾大学, Keiō Gijuku Daigaku),abbreviated as Keio (慶應) or Keidai (慶大), is a Japanese university located in Minato, Tokyo. It is known as the oldest institute of higher education in Japan. Founder Fukuzawa Yukichi originally established it as a school for Western studies in 1858 in Edo (now Tokyo). It has eleven campuses in Tokyo and Kanagawa. It has ten faculties: Letters, Economics, Law, Business and Commerce, Medicine, Science and Technology, Policy Management, Environment and Information Studies, Nursing and Medical Care, and Pharmacy.

The alumni include three Japanese prime ministers and prominent corporate leaders. In particular, alumni of the Faculty of Economics has had significant influence on Japanese business world. Keio ranks third in the world for the number of alumni holding CEO positions in Fortune Global 500 companies. The university is one of the Japanese Ministry of Education, Culture, Sports, Science and Technology's thirteen "Global 30" Project universities.

East Research Building in Mita

Keio University (慶應義塾大学, Keiō Gijuku Daigaku) was established in 1858 as a School of Western studies located in one of the mansion houses in Tsukiji by the founder Fukuzawa Yukichi. Its root is considered as the Han school for Kokugaku studies named Shinshu Kan established in 1796.^[23][24][25] It moved to the current location in 1871, established the Medical school in 1873, and the official university department with Economics, Law and Literacy study in 1890. and "Gijuku" as the translation of Keio changed its name as "Keio Gijuku" in 1868, which came from the era name "Keio"Public school.

Keio has been forming its structure in the following chronological order

Mita Sai

Keio holds school festivals every year in each campus. The main festival is called "Mita Sai" on Mita campus, which is usually held in late November. Mita Sai includes various activities for not only entertainment but also academic purposes. It is also a research workshop for students on Mita campus. Approximately 200,000 people visit Mita Sai every year.

Edward Bramwell Clarke and Tanaka Ginnosuke first introduced Rugby union to Japanese students at Keio University. (The game had been played in the treaty ports of Yokohama and Kobe before that, but not between Japanese teams.)

The interest of Keio's students in baseball stretches back to the early years of the 20th century; and the history of exhibition games was reported internationally. In 1913, an American professional team made of players from the New York Giants and the Chicago White Sox played the Keio team in an exhibition game. In a 1932 exhibition game, the Keio team beat the University of Michigan team which was then touring Japan. Keio's baseball team plays in the Tokyo Big6 Baseball League (six prominent universities in the Tokyo area).

Kei-So Sen

Traditionally, there has been a strong rivalry between Keio and Waseda University. There are annually many matches between 2 universities in several sports, such as baseball, regatta and rugby. These games are called "Kei-So Sen(慶早戦)", or more generally "So-Kei Sen(早慶戦)".

The Kei-So baseball game is especially famous because of its over 100 year history and importance in Japanese baseball history. The most famous Kei-So baseball match was held on 1943/10/16, and it was made into a movie titled "The Last Game - the Final So-Kei Sen -" in 2008.

There are 2 Kei-So baseball game seasons every year and they are usually broadcast by NHK. There is no lecture on all campuses in Keio on the game day because of the students who want to watch this match. Japanese emperors visited Kei-So baseball games 3 times in 1929,1950 and 1994.