Yasuo Fukuda(福田 康夫,Fukuda Yasuo, born 16 July 1936) was the 91st Prime Minister of Japan, serving from 2007 to 2008. He was previously the longest-serving Chief Cabinet Secretary in Japanese history, serving for three and a half years (2000–2004) under Prime Ministers Yoshirō Mori and Junichiro Koizumi.