Shigeru Ishiba, President of Japan's Liberal Democratic Party, was elected as the Prime Minister of Japan in the Diet's House of Representatives and House of Councillors nomination elections.

Ishiba Shigeru was born into a political family in the month of year. His father, Ishiba Jiro, served as the governor of Tottori Prefecture. Ishiba Shigeru has run for the presidency of the Liberal Democratic Party (LDP) times. He first ran in year and narrowly lost to Abe Shinzo in year. He ran again in and , but both times he was unsuccessful. In year, he ran for the th time and made a comeback in the final round against Takaichi Sanae, winning the presidency of the LDP for the th time.

On the date of this year, Shigeru Ishiba was elected as Japan's 99th Prime Minister. Just 12 days into his tenure, he announced the dissolution of the House of Representatives, setting a record as the fastest post-war Prime Minister to dissolve the House of Representatives. On the date of the month, the new House of Representatives election took place, with the ruling coalition consisting of the Liberal Democratic Party and Komeito suffering a defeat, failing to secure a majority in the new House of Representatives.

According to the Japanese Constitution, a special Diet session must be convened within a certain number of days after the House of Representatives election to conduct a prime minister nomination election. Following the rules and procedures, the prime minister nomination election is held in the order of the House of Representatives first and then the House of Councillors. This is the fifth time in Japanese history that the prime minister nomination election in the House of Representatives has entered the final round of voting. The last time the House of Representatives prime minister nomination election entered the final round of voting was in the year.