Although it is not known exactly when the tale was completed, the shihai monjo (an old document which was written on the other side of a piece of used paper) of "Heihanki" (diary of TAIRA no Nobunori) transcribed by FUJIWARA no Teika in 1240 states that "Jisho Monogatari volume Six, transcribed," therefore it is considered that the tale was completed before 1240.
正確な成立時期は分かっていないものの、仁治元年（1240年）に藤原定家によって書写された『兵範記』（平信範の日記）の紙背文書に「治承物語六巻号平家候間、書写候也」とあるため、それ以前に成立したと考えられている。