Lter, as the Imperial Diet began, Seimukenkyukai won over small groups and independent members and changed its name to Mokuyokai (on January 9, 1891, the name came from the fact that the meeting was held every Thursday (Mokuyo) at Kasumi Building) and from Mokuyokai to Doshikai (on March 12, 1891), and Kenkyukai was founded with 40 members on November 4, 1891.
その後、帝国議会の開始とともに小会派や無所属議員を取り込みながら、木曜会（1891年1月9日、なお毎週木曜日に霞会館において会合が開かれていた事に由来する）、同志会（同3月12日）と改称を続け、1891年11月4日に約40名で発足した。