Genroin was established succeeded from the Left State Council (an organ which report a legislative decision to the Central State Council) on April 25, 1875, by the agreement at the Osaka conference in 1875 among Toshimichi OKUBO, Hirobumi ITO, Takayoshi KIDO, and Taisuke ITAGAKI, and the document of the Emperor of the constitutional system given later.
1875年に大久保利通・伊藤博文・木戸孝允・板垣退助らの大阪会議での合意に基づき、続いて出された立憲政体の詔書によって1875年4月25日左院にかわり設置された。