-
- 2013.03
- The Prime Minister’s Office is reorganized into the Office for Government Policy Coordination and Prime Minister’s Secretariat
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- 2008.07
- The function of coordinating policies for central administrative organizations is added to the Prime Minister’s functions
-
- 2008.02
- The Office for Government Policy Coordination and the Prime Minister’s Secretariat are integrated into the Prime Minister’s Office
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- 1998.02
- Renamed as The Office for Government Policy Coordination
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- 1973.01
- The Administrative Coordination Office is established
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- 1963.12
- The Prime Minister’s Secretariat is re-established
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- 1962.04
- The Secretary of the Chief Cabinet Minister is established
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- 1960.08
- The Prime Minister's Secretariat is established