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National Diet

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The National Diet is the central legislative body of Japan. It serves as the nation's highest organ of state power. Under the Constitution of Japan, it is the sole organ for making laws. The Diet consists of two distinct chambers. The first is the House of Representatives, known as the Shūgiin. The second is the House of Councillors, called the Sangiin. These two houses meet in the Nagatachō district of Chiyoda, Tokyo.

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Both houses use a parallel voting system to select members. This means voters cast two separate ballots during an election. One vote is for an individual candidate in a specific constituency. The second vote is for a political party list. Any Japanese national aged 18 or older may vote. This voting age was lowered from 20 in 2016. The Constitution guarantees universal adult suffrage and secret ballots. It also forbids discrimination based on race, sex, or social status.

The Diet has several critical responsibilities beyond passing laws. It must approve the annual national budget submitted by the government. It also handles the ratification of international treaties. The Diet is responsible for nominating the Prime Minister through a formal resolution. This process establishes legislative supremacy over the executive branch. Furthermore, the Diet can initiate amendments to the Constitution. If such changes are approved, they must be decided by the people in a referendum. The Diet also has the power to investigate the government and impeach judges.

There is a significant difference in power between the two houses. The House of Representatives is the more powerful chamber. While the House of Councillors can delay some actions, it has little power over the Prime Minister. If the House of Representatives passes a bill and the upper house rejects it, the lower house can overrule them. This requires a two-thirds majority vote of the members present. If the houses cannot agree on a budget or a treaty, the decision of the lower house is deemed the final decision. The House of Representatives can also dissolve the government through a motion of no confidence.

The history of Japan's legislature began with the Imperial Diet in 1890. This was established under the Meiji Constitution. During that era, the Emperor exercised legislative power with the Diet's consent. The first Imperial Diet faced intense political tensions. For example, Prime Minister Yamagata Aritomo clashed with the Diet over military funding. Many critics argued for infrastructure and lower taxes instead of high military spending. The current National Diet took its modern form in 1947. This happened following the adoption of the post-war constitution.

Specific rules govern who can serve in the Diet. Candidates for the House of Representatives must be at least 25 years old. Candidates for the House of Councillors must be at least 30 years old. All members must be Japanese nationals. Members receive a monthly salary of approximately ¥1.3 million. They are also entitled to employ three secretaries using taxpayer funds. To help them travel to their home districts, they receive free Shinkansen tickets and four round-trip airplane tickets each month.

Issues regarding representation and population shifts remain important. Because people moved to cities, some areas have more people than others. This can lead to malapportionment, where some votes carry more weight than others. In the 2022 election, the malapportionment ratio was 3.03 for the House of Councillors. For the 2024 House of Representatives election, the ratio was 2.06. The Supreme Court of Japan began reviewing these laws after a 1976 decision. This decision invalidated an election where one district had five times the representation of another.

The legislative process often begins with the Cabinet. Most bills are drafted by relevant government ministries. These ministries may consult advisory committees. These committees can include university professors, industry representatives, and local mayors. Once a bill is drafted, it goes to the Cabinet Legislation Bureau and the ruling party. This complex system ensures that many different perspectives are considered before a law is finalized. After both houses pass a bill, the Emperor promulgates it to make it official.

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