The Diet consists of two Houses — the House of Representatives and the House of Councillors; each House is composed of elected Members, who represent all the people.
Each House has plenary sittings and committees. In addition, each House has a Commission on the Constitution, a Board of Oversight and Review of Specially Designated Secrets, and a Deliberative Council on Political Ethics.
The Diet as a whole also has the Judge Indictment Committee to institute removal proceedings against judges and the Judge Impeachment Court to try those judges.
|House of Representatives||House of Councillors|
|465||Number of members||245|
(Membership ends with the dissolution of the House)
|Term of office||
(with half of the Members elected every third year)
|Citizens 18 years of age or older||Right to vote||Citizens 18 years of age or older|
|Citizens 25 years of age or older||Right to stand for office||Citizens 30 years of age or older|
Single-seat constituency: 289
Proportional representation: 176
Plural-seat prefectural constituency: 147
Proportional representation: 98