6. Yoshimasa Hayashi
Yoshimasa Hayashi is the leader of the Democratic Liberal Party. He is the member of the House of Councilors and currently serves his 3rd term in the upper house of the Japanese parliament.
He entered in to politics as the secretary to his father Yoshiro Hayashi who is the finance minister in 1992. Yoshimasa Hayashi estimated net worth is 33 million dollars and he is ranked at sixth place in the list of top 10 richest politicians of Japan.