The Tobu Tojo Line is a 75.0 km (46.6 mi) suburban railway line in Japan which runs from Ikebukuro Station in Toshima, Tokyo to Yorii Station in Yorii, Saitama, operated by the private railway operator Tobu Railway. Its official name is the Tobu Tojo Main Line , but it is referred to as Tobu Tojo Line on Tobu signage and publicity information.

Ikebukuro Station is a major railway station located in the Ikebukuro district of Toshima, Tokyo, Japan, shared by the East Japan Railway Company, Tokyo subway operator Tokyo Metro, and the two private railway operators Seibu Railway and Tobu Railway. With 2.71 million passengers on an average daily in 2007, it is the second-busiest railway station in the world, and the busiest station in the Tobu, Seibu, and Tokyo Metro networks. It primarily serves commuters from Saitama Prefecture and other residential areas northwest of the city center. It is the Tokyo terminal of the Seibu Ikebukuro Line and the Tobu Tojo Line.