History
Tameike-Sannō Station opened on 30 September 1997 as the southern terminus of the Teito Rapid Transit Authority's Namboku Line extension from Yotsuya, with the Ginza Line platforms inserted at the same time as a retrofit transfer between the two lines. It is the youngest station on the Ginza Line. The composite name resolved a dispute between Minato and Chiyoda wards, each of which preferred its own provisional title. In 1998 it was named to the Kantō "100 Best Stations" list. Through Namboku-Line service to Meguro began on 26 September 2000, and Tokyo Metro inherited the facilities on 1 April 2004.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.
Notes
Because the Ginza Line had not anticipated a station here, planners shifted the running rails sideways and built the island platform on the old alignment, leaving an unusually generous platform width.