September 1
 Disaster Prevention Day Drills
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September 1
 Award Ceremony for the Athens Olympic Team
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September 2

Prime Minister Views the Northern Territories
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September 3
 Prime Minister Honors Contributors to Disaster Prevention |
September 7
 Representatives of the Ship for Southeast Asian Youth Program (SSEAYP) Pay Courtesy Call on Prime Minister |
September 8
 Brazilian Coordinators for International Relations Pay Courtesy Call on Prime Minister
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September 9
 Thirty-ninth Meeting of the Council for Science and Technology Policy
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September 10
 Twenty-fourth Meeting of the Council on Economic and Fiscal Policy (CEFP)
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September 14

The First Day of Prime Minister's Visits to Brazil
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September 15
 The Second Day of Prime Minister's Visit to Brazil
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September 16
 The Third Day of Prime Minister's Visit to Brazil
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September 17

Japan-Mexico Summit Meeting
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September 20
 Japan-Afghanistan and Japan-Iraq Summit Meetings
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September 21
 Japan-US Summit Meeting Prime Minister Delivers Speech at the United Nations General Assembly
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September 22
 Press Conference Following the 59th Session of the United Nations General Assembly Prime Minister Meets with the Chairman of the High-Level Committee
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September 24
 Prime Minister Has Been Appointed to Honorary Chairman of the 2005 World Exposition, Aichi, Japan
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September 27
 Inauguration of the Reshuffled Second Koizumi Cabinet
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September 29

Prime Minister Appoints Senior Vice-Ministers
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October 30
 Prime Minister Appoints Parliamentary Secretaries
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