日媒：小泉进次郎正式宣布参选日本自民党总裁

Core Points - The current Minister of Agriculture, Forestry and Fisheries, Shinjiro Koizumi, has officially announced his candidacy for the presidency of the Liberal Democratic Party (LDP) of Japan [1] - The LDP presidential election is scheduled for October 4, with results to be announced on the same day [1] - Following the election of the new LDP president, a vote for the Prime Minister will take place in the National Diet, where the new president is expected to succeed Shigeru Ishiba and become the next Prime Minister of Japan [1] Summary by Category - Election Announcement - Shinjiro Koizumi has declared his intention to run for the LDP presidency [1] - Election Schedule - The LDP presidential election will occur on October 4, with results revealed on that day [1] - Political Implications - The new LDP president will be positioned to become the next Prime Minister, as the LDP remains the largest party in both houses of the National Diet [1]