In 1608, Suden was invited to Sunpu by Ieyasu TOKUGAWA, who located the bakufu (Japanese feudal government headed by a shogun) in Edo by superseding the Toyotomi government, and served as a diplomatic secretary in place of last Jotai SAISHO.
1608年には豊臣政権に代わり江戸幕府を開いた徳川家康に招かれて駿府へ赴き、没した西笑承兌に代わり外交関係の書記を務めた。