From the ninth century, exchange between groups of Haji craftsmen (Hajibe) and Sue craftsmen (Tobe) grew, resulting in the creation of a large volume of earthenware that is midway between the two in terms of design, such as Rokuro-haji and Haji-shitsu pottery.
9世紀以降は土師器工人集団（土師部）と須恵器工人集団（陶部）との交流が活発になり、轆轤土師器、土師質土器などと呼ばれる両者の中間様式の土器が多量につくられるようになった。