Parliament (the Riksdag) is the sole legislator. This means that the responsibility for approving all new or amended legislation lies with Parliament. The fundamental laws are the supreme laws of the land. Certain matters can only be
regulated by act of law, while others may be regulated in the form of secondary legislation (ordinances), provided the Government has regulatory authority based either directly on the Constitution or on delegation from Parliament.
Document link: The Swedish Law-Making Process (pdf)