As can be seen from the fact he had a job at the Danjodai which formed the base of the radical advocates of Sonno Joi within the new government, he still held the nationalistic idea of Joi (expelling the foreigners) at that time.
新政府内部の過激尊攘派の拠点ともいえる弾正台に職を得たことから見て取れるように、この時期の吉岡の思想はいまだ攘夷論志士としてのそれを引きずるものであった。