The time of its formation is considered to be the latter half of the twelfth century because "Mumyozoshi" (critique of tales) commented on tales in the Kamakura period as 'many have recently appeared' and mentioned this work.
成立時期は、『無名草子』が「むげに此頃出で来るもの」として鎌倉時代の物語を評して本作品に及ぶことなどから、12世紀後半であろう。