As the oldest extant text of the "Kokin wakashu," it is a vitally important source for students of the history of Japanese literature and the history of the Japanese language, and moreover has been held in great esteem from time immemorial as the most prominent example of calligraphy in kana (a syllabic script), making it a work of tremendous importance for the history of Japanese calligraphy.
『古今和歌集』の現存最古のテキストとして、日本文学史、日本語史の研究資料として貴重であるとともに、その書風は仮名書道の最高峰として古来尊重され、日本書道史上もきわめて重要な作品である。