Just like Hidematsu WADA, he conjectured that the first half of the record of Minamoto clan shogunate indicates that the book was compiled in the reign of Tokimune and Masamura, after July of 1242, and around 1270, while the latter half was compiled after February of 1290, because the side notes in the 42nd volume of the record of shogun Prince Munetaka says Emperor Gofukakusa became a priest then.
前半の源氏三代将軍記の編纂年代は和田英松同様に時宗・政村の時代、1242年（仁治3年）7月以降、1270年前後とするが、後半は第42巻の宗尊将軍記の袖書きに後深草天皇が1290年（正応3年）2月に出家していると記していることからそれ以降。