Since the generation of OZUKI no Takanobu in the eleventh century, the Ozuki clan gained hereditary control over the position and solidified their status as a Kanmu family with authority over benkan (officials of the dajokan) and official works of the government.
11世紀頃小槻孝信の代からは世襲となって、弁官を取り仕切り官中を統轄する官務家としての地位を確立した。