Taisuke ITAGAKI, who had lost in the political upheaval in Seikanron in 1873 and retired from the governmental position, and his comrades gathered at the residence of Taneomi SOEJIMA in Ginza, Kyobashi Ward, Tokyo and formed a political party on January 12, 1874.
征韓論、明治六年の政変で下野した板垣退助らは、幸福安全社を基礎に明治7年（1874年）1月12日、東京の京橋区銀座副島種臣邸に同士を集めて結成。