Toei Mita Line

The Toei Mita Line (都営三田線, Toei Mita-sen) is a subway line of the municipal Toei Subway network in Tokyo, Japan. The line runs between Nishi-Takashimadaira in Itabashi and Meguro in Shinagawa. Trains continue with direct service into the Meguro Line of Tokyu Corporation for Hiyoshi. The portion between Shirokane-Takanawa and Meguro is shared with the Tokyo Metro Namboku Line.

The line was named after the Mita district in Minato, Tokyo, under which it passes. The name “Mita Line” dates to 1904, when a Tokyo tram line of the same name opened, operating above ground between Hibiya and Mita along the route of the present line.

In fiscal year 2023, the Mita Line was Toei's second most profitable line, earning 6.30 billion yen in surplus (after the Asakusa Line). It served 606,811 passengers on average per day, the lowest in the Toei network.

On maps and signboards, the line is shown in blue. Stations carry the letter "I" followed by a two-digit number.