As for the revision of treaty, he achieved to conclude Japan-Mexico Treaty of Amity, Commerce, and Navigation which was an equal treaty with Mexico, so the negotiation for the unequal treaty with the powerful countries seemed to be going well.
また条約改正の分野でも、メキシコとの間に平等条約である日墨修好通商条約を締結することに成功、列強との条約改正交渉も順調に行くかに見えた。