Nishinomaru Roju was not engaged in the affairs of the bakufu but was solely responsible for housekeeping of Ogosho (leading or influential figure) or the heir of Shogun who resided in Nishinomaru.
西の丸老中は幕政には関与せず専ら西の丸に居住する大御所や将軍嗣子の家政を総括していた。