In the late Edo period, the present-day Uchiwaisaichō area was a part of the Hibiya area. Many daimyō's mansions were located in the area, which was within the outer moat of Edo Castle.
After the Meiji Restoration, it was known for a time as Uchiyamashita-cho before the name "Uchisaiwaichō" was adopted after its location between Saiwaibashi Bridge (幸橋, Saiwaibashi) on the Outer Moat and Saiwai Gate (幸御門, Saiwai-gomon). The Tokyo National Museum was originally located in the area.
Before Yamato Life declared bankruptcy, its headquarters was in Uchisaiwaichō.[3]
Education
Chiyoda Board of Education [ja] operates public elementary and junior high schools. Chiyoda Elementary School (千代田小学校) is the zoned elementary school for Uchisaiwaichō 1-2 chōme.[4] There is a freedom of choice system for junior high schools in Chiyoda Ward, and so there are no specific junior high school zones.[5]