On August 27, 2007, he was appointed Chief Cabinet Secretary to Prime Minister Shinzo Abe, replacing Yasuhisa Shiozaki.

[2] Following the resignation of Prime Minister Yasuo Fukuda, Yosano announced his candidacy for the LDP presidency on September 8, 2008: "I believe politicians should never mislead the public by showing some rosy pictures.

[5] In Aso's cabinet, appointed on 24 September 2008, Yosano retained his post as Minister of Economic and Fiscal Policy.

[7] He left the Sunrise Party on 13 January 2011[8] to join the Naoto Kan's cabinet as Minister of Economic and Fiscal Policy.

[11] His hobbies included golf, making computers, photography, fishing, and playing Japanese board games.