According to the CIA World Factbook, Sweden's government is a constitutional monarchy. In this system, the monarch's powers exist within strict constitutional limits. Sweden has had this system of government since the adoption of its constitution in 1809.
In Sweden's case, the monarch is the chief of state, but his powers and duties are entirely ceremonial. Real power in Sweden rests in the country's unicameral legislature, the Riksdag. This 349-member body elects a prime minister who serves as head of government. The prime minister selects the heads of executive agencies. Though the monarch did not exercise real power in Sweden after 1917, he was the official head of government until 1975, when the constitution was reformed. As of 2014, the king of Sweden is Carl XVI Gustaf, and the prime minister of Sweden is Fredrik Reinfeldt.