This line forms part of the proposed Tobu Nishi-Ita Line (東武西板線?) which was never completed. The Tōbu Nishi-Ita line was intended to link the Tobu Skytree Line and Tobu Tojo Line to allow efficient transfer of rolling stock, and improve the service for residents along the line.
The line opened on December 20, 1931, as the Tobu Nishi-Ita Line from Nishiarai to Daishimae, with a total distance of 1.1 km. Operation was suspended from May 20, 1945. Operations resumed from May 21, 1947, with the line renamed Tōbu Daishi Line.
On December 1, 1968, Daishimae station was relocated due to road extension, shortening the line by 100 m. On July 26, 1991, the track was elevated.