Nobusuke Kishi
Ikeda became prime minister in 1960, when Nobusuke Kishi resigned following the disastrous 1960 Anpo Protests. As a trained economist and trusted member of Ikeda's "brain trust," Ōhira helped design and implement Ikeda's famed Income Doubling Plan, which helped turn the attention of the Japanese people away from contentious political struggles to a nationwide drive for economic growth.