The is a Japanese thoroughbred horse race on dirt track only for three year old horses. It is graded as a Domestic Grade I. It is run over a distance of 1,800 meters (about 9 furlongs) at Oi Racecourse in Shinagawa, Tokyo in April or May.
It began in 1955 as the Oi Hai. Its name was changed to Haneda Hai in commemoration of Haneda racecourse which used to be situated next to Shinagawa.
Its distance has been changed several times. It has been run as follows:
Until 2023, this race was the first leg of the South Kanto (Minami-Kanto) triple crown with Tokyo Derby and Japan Dirt Derby and only horses belonging to Minami-Kanto Horseracing could run.
The race was promoted to Domestic Grade 1 (Jpn1) along with Tokyo Derby in 2024. Formerly the first leg of the South Kanto (Minami-Kanto) Triple Crown, it became the first leg of new Japanese Triple Crown of Dirt. Entries were expanded to 16 horses with 4 JRA horses and 12 NAR horses.
Trial races provide automatic berths to the winning horses or placed horses as specified.