Tsuchiya Masanao served as [[Kyoto shoshidai]] from [[1685]]/9/23 to [[1687]]/10/13, at which time he became a ''[[roju|rôjû]]''.
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Tsuchiya Masanao served as a member of the ''[[roju|rôjû]]'' for over thirty years, through the reigns of [[Shogun]] [[Tokugawa Tsunayoshi]], [[Tokugawa Ienobu|Ienobu]], and [[Tokugawa Ietsugu|Ietsugu]].<ref name=Tashiro>Tashiro Kazui, "Chôsen tsûshinshi gyôrestu emaki no kenkyû," ''Chôsen gakuhô'' 137 (1990/10), 21.</ref>
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He previously served as [[Kyoto shoshidai]] from [[1685]]/9/23 to [[1687]]/10/13, before being named to the ''rôjû'' in 1687.
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In [[1705]], Tsuchiya was named ''Chôsen goyô'', meaning he was appointed to be the primary member of the ''rôjû'' to liaise with the [[So clan|Sô clan]] lords of [[Tsushima han|Tsushima domain]] in handling formal diplomatic relations with [[Joseon dynasty]] Korea.<ref name=Tashiro/>