In particular, the critical remarks and evaluations he included in his diary of the insei (rule by retired emperors) system as well as the internal strife besetting the sekkan seiji (government by regents and advisors), not to mention his commentary on the internal strife facing the Minamoto clan and the rise of the Taira clan, ensure his fame as one who left behind a valuable historical record, and his diary, the "Chuyuki" (Diary of Nakamikado, Minister of the Right) remains a precious historical document that captures the essence of the trends in the last days of the Heian period.
特に、摂関家の内紛や院政に対する批判や批評を行い、源氏の内紛、平家の台頭に関しても貴重な史料を残している人物で、その日記、『中右記』は平安時代後期の趨勢を知る上で貴重な史料。