Japan Farmers Party was created in 1926.
Japan New Party was created in 1992.
Japan Proletarian Party was created in 1937.
Japan Innovation Party was created in 2010.
Japan Nation Party was created in 1988.
Leftist Socialist Party of Japan was created in 1948.
Rightist Socialist Party of Japan was created in 1948.
Democratic Socialist Party - Japan - was created in 1960.
Democratic Party of Japan was created on 1998-01-08.
Social Democratic Party - Japan - was created in 1945.
Japan Labour-Farmer Party was created on 1926-12-09.
New Socialist Party - Japan - was created on 1996-03-03.