When a person was appointed to Roju, the daimyo and the hatamoto who possessed the same official title as that of the new Roju, except those whose shikoseki (waiting room) was Oroka (a big corridor), Ohiroma (a big hall), or Tamarinoma (literally, a gathering-together hall), changed their official titles voluntarily.
新たな老中が就任すると、同じ官名の伺候席大廊下（おおろうか）、伺候席大広間（おおびろま）、伺候席溜間以外の大名や旗本は自主的に官名を変更したのである。