Kuniaki Koiso
From October 1934 to May 1935, Yoshida served as Chief Cabinet Secretary under the Okada administration and was also appointed to a seat on the Planning Board. In 1937, he was appointed to the Upper House of the Diet of Japan. He was asked to become Minister of Welfare under the Yonai administration from January to July 1940, and was appointed governor of Fukuoka Prefecture in July 1943 by Prime Minister Hideki Tōjō. Under Tōjō’s successor, Kuniaki Koiso, Yoshida was recalled to Tokyo to serve as Minister of Munitions from December 1944 to April 1945. As Munitions Minister, he attempted to construct underground armament-manufacturing facilities to protect them from aerial bombing.