It is considered that many mound-type graves built during the period, a style was one of the grave styles characteristic of the Mayor period, and were for chiefs of these large-sized communities, and it is considered that society started becoming hierarchical.
当時多く築造された弥生時代の墓制墳丘墓は大型地域集団の首長墓と見られ、身分差が生じ始めていたことの現れだと考えられている。