The National Assembly of Thailand, as the bicameral legislative branch of the government, consists of the House of Representatives and the Senate. The House of Representatives is the lower house of the National Assembly and consists of 500 members sitting for four years; 350 members are elected from a constituency basis and 150 members are elected from a party-list proportional representation. The Senate consists of 250 senators that hold a five-year term. Under section 107 of the 2017 constitution, senators are selected from professional and social groups, having the knowledge, expertise, and experience in various areas of society.