WEBYukio Hatoyama (鳩山 友紀夫, born 鳩山 由紀夫, Hatoyama Yukio, born 11 February 1947) is a Japanese politician who served as Prime Minister of Japan and Leader of the Democratic Party of Japan from 2009 to 2010. He was the first Prime Minister from the modern Democratic Party of Japan. [1] .