In 1858,
Fukuzawa Yukichi founded the . Ten years later the school's name changed to Keio Gijyuku (慶應義塾); in 1871 it moved to
Mita, its main campus. The campus has a number of historic structures. ;
Maboroshi no mon :The former main gate, the original black wooden gate dated to the
Edo period. The present stone gate was built in 1913. In 2000, the gate was moved to top of a sloping stone walkway. ; : The original building was constructed in 1876. In 1947 the tile-roofed, two-story, Western-style wooden building was restored, and in 1967 it was designated an important cultural property. ;
Inari yama :
Inari yama is atop a flight of stone steps near the Speech Hall. Its name originated from the , built by the
Shimabara clan, which was previously located there. Although the shrine is gone, its name persisted after the university's founding. ; :The old library and the Speech Hall are iconic campus buildings. The library was completed in 1912 as part of the university's 50th-anniversary celebrations. Designed by
Sone Tatsuzō with his architectural partner . It includes the Fukuzawa Memorial Center of modern Japanese studies and the Institute of Oriental Classics (''''). ; : The campus administration building is known as
Jyukukan-kyoku. Completed in 1926, it replaced a two-story brick building dating to 1886.
Jyukukan-kyoku houses a number of departments, offices and meeting rooms. ; : Built in 2011, the new
Minami kōsha was part of the university's 150th-anniversary celebration. Its design is similar in its modernism to the old
Minami kōsha. The building has a mixture of lecture, study and multipurpose rooms. ; : The old school building was constructed for the university's centenary in 1959. The 36-room building, with a capacity of 2,721, was the largest building on the Mita campus for many years. ; : Built in 2000, the East Research Building was designed like an old brick library. Near
Maboroshi no mon, its arch features a quotation by Fukuzawa Yukichi in Latin:
Homo nec ullas cuiquam praepositus nec subditus creatur ("Heaven does not make one man better or worse than others"). The
is named for American writer and medical doctor
Michael Crichton. ; : The South Annex was built in 2009 to provide lecture space during the construction of the south building. The annex is headquarters for research coordination and administration, a research and administration center for the arts and a training room for the graduate school of human relations and the Institute of Cultural and Linguistic Studies. ; : Designed by
Fumihiko Maki, the new library was completed in 1982. The building has six stories above ground and five underground. Maki won the 1982
BCS prize for his design. ; : Built by
Taisei Corporation in 2005, the seismically-isolated, reinforced-concrete South Building has eleven stories above ground and five underground. The building has classrooms, offices and training and counseling rooms. ; New Banraisha : Banraisha is a social club for alumni, teachers and students. Designed by
Yoshirō Taniguchi and
Isamu Noguchi, it was begun in 1946 to replace an 1887 building destroyed by American
B-29 bombers in 1944 during the
Pacific War. The was completed in 1951. In 2005, it (and its garden) was moved to the roof of the South Building. ; : The West Building was constructed in 1959 (at the same time as the old
Minami kōsha) as part of the university's centenary, on the site of the (which was destroyed in a 1945 aerial attack). ; Graduate-school building :The graduate-school building was constructed as part of the university's 125th anniversary. It houses classrooms, research rooms and offices. Other buildings include: • : Keio University Athletic Association and
Mita Bungaku offices, internal audit services • : Conference hall, health center and offices • : Classrooms and offices • : Offices, meeting and research rooms •
Keio University Press: International dormitory ==Hiyoshi campus==