5. Hakubun Shimomura
Hakubun Shimomura is a member of the Japanese house of representative from the Democratic Liberal Party. He is the current minister of sports, culture, education, science and technology in the Shinzo Abe cabinet.
He also served in the Tokyo assembly for two times since 1980 and first elected as the member of the house of representative in 1996.
He is also the member of the 2020 Olympics organizing committee and oversaw the preparation about summer Olympics. Hakubun Shimomura estimated net worth is 36 million dollars and he is ranked at No. 5 in the list of top 10 richest politicians of Japan.