Dai Hakken (大発見 ; literally great discovery) is the fifth studio album by Japanese rock band Tokyo Jihen, released on June 29, 2011 in Japan through EMI Music Japan and Virgin Music. The album was produced by the band and Japanese recording engineer Uni Inoue.

In this album, the characters making up the song titles are aligned in all songs except for the additional English words in the first and last song as well as the additional seven characters on track 7. Ringo Sheena's tradition of symmetrically matching song titles written in Kanji, Hiragana and Latin characters throughout the album, however, was broken for this record. Some of titles of the official European language were named for a movie (especially French movie).

All lyrics written by Ringo Sheena except for "Kaitei ni sukuu otoko", all music arranged and performed by Tokyo Jihen except for "On'nanoko wa dare demo", arranged by Takayuki Hattori and performed by the Tokyo Magical Big Band. In collaboration, the former submitted the basis of music, and the latter finished it.

All official European language titles according to Ringo Sheena's website.

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