This paper considers the Iwamatsu Tsuneie clan trend by comparing and examining Taiheiki and historical records. In the conventional history, it was the principal axis to research of the capability of the politics and the military affairs of a Nitta Yoshisada individual, the Southern Dynasty, meaning, etc.Moreover, in Nitta clan research in Taiheiki, it was the mainstream to consider Yoshisada\u27s person image which led comparison with other generals. Then, I would like to clarify the Iwamatsu clan image in the view to the Iwamatsu Tsuneie clan of the Tiheiki author, or Taiheiki by performing contrast of Taiheiki and historical records.The ancient documents of houses, etc. are used for historical records. I utilize Taiheiki,the Seigenin-bo...