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The ministries of Japan are the most influential part of the executive branch of the Japanese government. Each ministry is headed by a Minister of State appointed by the Prime Minister. In postwar politics, the posts of ministers have been given to senior legislators, mostly of the LDP. However, few ministers serve for more than one or two years to develop the necessary grasp of the organisation to become really influential. Thus, most of the power lies within the ministries, with the senior bureaucrats.
As a result of the Central Government Reform in 2001, many Ministries are reformed.