When Treaty of amity and commerce between the United states and Japan was concluded in 1858, he was arrested as 'a person who plotted' in Ansei no Taigoku (suppression of extremists by the Shogunate) by Naosuke II because he was against the Imperial sanction for the treaty and was punished with house arrest of 50 days.
1858年、日米修好通商条約が起こると、条約勅許に反対したため、井伊直弼による安政の大獄で「悪謀企策の者」として逮捕され、謹慎50日間を命じられた。