Riksdag Riksdag The Riksdag ( or "Sveriges riksdag") is the national legislature and the supreme decision-making body of Sweden. Since 1971, the Riksdag has been a unicameral legislature with 349 members (), elected proportionally and serving, from 1994 onwards, on fixed four-year terms. The constitutional functions of the Riksdag are enumerated in the Instrument of Government (), and its internal workings are specified in greater detail in the Riksdag Act (). The seat of the Riksdag is at Parliament House (), on the island of Helgeandsholmen in the central parts of Stockholm. The Riksdag has its institutional roots in the feudal
Riksdag members of the Riksdag are elected in the general elections held every four years. All Swedish citizens who turn 18 years old no later than on the day of the election are eligible to vote in and stand for elections. A minimum of 4% of the national vote is required for a party to enter the Riksdag, alternatively 12% or more within a constituency. Substitutes for each deputy are elected at the same time as each election, so by-elections are rare. In the event of a snap election, the newly elected members merely serve the remainder of the four-year term.