3 (1958) as an underground line running from Tenjimbashisuji Rokuchōme to Tenma via Sakaisuji and Dobutsuen-mae, and it was to be operated by Hankyu Railway instead of the Osaka prefectural government.

7 (1963) recommended that the southern terminus of the Sakaisuji Line be at Tengachaya instead of Tenma.

Later unrealised plans for the Sakaisuji Line included two separate extensions to Nakamozu and Sugimotochō, and at one point it was envisioned that through-services between the standard-gauge Hankyu Railway and the narrow-gauge Nankai Railway would be realised by connecting them together with the Sakaisuji Line through the use of dual gauge tracks, however that plan was abandoned due to the different electrification systems used by Hankyu and Nankai.

[3][page needed] The Sakaisuji Line opened on December 6, 1969 between Tenjimbashisuji Rokuchōme and Dōbutsuen-mae,[4] at which point the previous ground-level southern terminal of the Hankyu Senri Line at Tenjinbashi was closed.

All trains are based at Higashi-Suita Depot located on the Hankyu Senri Line.