TheNational Assembly of Thailand (Abrv: NAT;Thai:รัฐสภาไทย,RTGS: Ratthasapha Thai lit. 'Sabha of the ThaiRashtra',pronounced[rát.tʰa.sa.pʰāːtʰāj]) is thebicamerallegislative branch of thegovernment ofThailand. It convenes in theSappaya-Sapasathan,Dusit District,Bangkok.
The National Assembly was established in 1932 after the adoption of Thailand'sfirst constitution, which transformed Thailand from anabsolute monarchy to aconstitutional monarchy.
During the2013 political crisis, theHouse of Representatives was dissolved by Prime MinisterYingluck Shinawatra who called for election on 2 February 2014 until it was nullified by theConstitutional Court. After the2014coup d'état, the National Assembly was replaced by the military-backed, unicameralNational Legislative Assembly according to the2014 constitution.
After the promulgation of the2017 Constitution in April 2017, the National Assembly was reestablished but the constitution allowed the military National Legislative Assembly to temporarily remain in place until the National Assembly was formed following the2019 general election.
This section'sfactual accuracy may be compromised due to out-of-date information. The reason given is: information on women's representation is outdated—women's prorportion as of the most recent election is 19.4%. Please help update this article to reflect recent events or newly available information.(February 2024) |
The Assembly is a bicameral legislature composed of a Senate and a House of Representatives. Combined, the Assembly has 700 members, 500 of which were elected directly through a general election (500MPs in the lower house). Others include all 200 members of the Senate being elected indirectly among the candidates.[1] The majority of elections in Thailand follow thefirst-past-the-post system which is used in the elections for the 400 members of the House of Representatives. The remaining 100 members of the House are elected byparty list proportional representation.
Thailand's parliament is overwhelmingly male, at 80.6%. Representation by women is 19.4%, below the Asian average is 20 percent, and the global average for female parliamentarians of 24 percent. All fall short of the 30 percent considered satisfactory by United Nations Women.[2][3]
Theupper house is called theSenate of Thailand. The chamber is non-partisan and has limited legislative powers. The Senate is composed of 200 members indirectly voted by candidates from 20 professional and social groups.[4] A term in the Senate is five years. It forbids members from holding any additional office or membership inpolitical parties.[5]
Even though the chamber is mandated to be nonpartisan, many media and analysts have categorized legislators into political factions:
| Faction | Person Nominatated for President | Seats (Estimated) | |
|---|---|---|---|
| Blue Group, with ties toBhumjaithai Party | Mongkol Surasatja (president) | 150+[6] | |
| New Breeds, which promote liberal and progressive agenda | Nantana Nantavaropas | 30-[7] | |
| Unaffiliated/Others | Premsak Piayura | 30-[7] | |
Note: All of these numbers may not be 100% accurate.
Thelower house is called theHouse of Representatives of Thailand. The chamber is made up of 400 members from single constituency elections and 100 members from "proportional representation" by party lists, as codified in the2007 Constitution of Thailand. Thailand's "proportional representation" is, in fact,parallel voting, often described as "mixed member majoritarian" (MMM). This is where the 100 seats are apportioned to political parties in accordance with the "proportional representation" popular vote each party receives. Every eligible voter in Thailand in a general election has two votes. The first is for constituencyMP. The second vote is for the party the voter prefers. The second category is then added and the results divided into eight electoral areas. The other 400 seats are directly elected on a constituency basis. The House's term is four years, however, adissolution can happen at any time.[8]
Elections in Thailand are held underuniversal suffrage; however, some restrictions apply: The voter must be a national of Thailand (if not by birth then by being a citizen for 5 years), must be over 18 years old before the year the election is held, and must have registered 90 days before the election. Those barred from voting in House elections are: members of thesangha orclergy, those suspended from the privilege for various reasons, detainees under legal or court orders, and those who are of unsound mind or of mental infirmity. Voting in Thailand iscompulsory.[9]
ThePresident of the National Assembly of Thailand is anex officio position occupied by theSpeaker of the House of Representatives of Thailand, who upon election as Speaker of the House, will automatically assume office as President of the National Assembly. The Vice President of the National Assembly of Thailand is also anex officio position occupied by thePresident of the Senate of Thailand.[10][11]
The powers of the National Assembly are enshrined in Chapter 6, Part 7 of the2007 Constitution of Thailand.[12] The main powers of the National Assembly are its legislative powers. The procedure for an enactment of a bill is as follows:

TheGovernment of Thailand, particularly theCabinet of Thailand is answerable directly to the National Assembly. The constitution mandates that within 15 days of being sworn in, the Cabinet must state its policies to the National Assembly.[18] The National Assembly has the authority to call any minister to appear before it at any time to explain policies or answer questions. This power of scrutiny is important as some members of the Cabinet need not be members of the National Assembly. If they are a member, they can only be from the lower house or the House of Representatives, as the constitution expressly forbids members of the Senate from being members of the Cabinet.[19]
As the prime minister is selected from the ranks of the House of Representatives and elected by the house, the prime minister is therefore directly responsible to the legislature. The National Assembly can compel him to appear before it like any other minister, and force him to explain policies and answer questions, just like any other member of the Cabinet. In reverse the Cabinet also has some powers over the National Assembly. The Cabinet can, according to the constitution, call an emergency session of the National Assembly at any time.[20]
Apart from its legislative and oversight functions, the National Assembly has the power of appointment and removal. The house is given exclusive right to elect the Prime Minister of Thailand. First the candidate must receive the support of one-fifth of all members. Afterwards, a simple majority vote will confirm his appointment which will be made officially by the monarch. The royal assent is then countersigned by the President of the National Assembly.[21]
The Senate is given exclusive powers to advise on the appointment of members of the judiciary and members of independent government organizations. These include judges of theConstitutional Court of Thailand; members of theElection Commission; members of theNational Anti-Corruption Commission and theNational Human Rights Commission.[22] However, the power to appoint members of the State Audit Commission (including the Auditor General) belongs to the monarch, with a counter signature of the President of the Senate.[23]
The National Assembly has the power to impeach and remove these officers. The prime minister can only be removed by the house in avote of no confidence. Members of the Cabinet are not appointed by the National Assembly, but they can be removed by the National Assembly in a similar process. This time the vote of no confidence is allowed by both or individual houses. Judges and independent government officers can also be removed by both houses of the National Assembly.[24]
The two houses of the National Assembly have different terms of office. In accordance with the constitution, the Senate is elected to a five-year term, while the House is elected to a four-year term. Overall, the term of the National Assembly is based on that of the House. The National Assembly each year will sit in two sessions: an "ordinary" session and a "legislative" session. The first session of the National Assembly must take place within 30 days of ageneral election of the House of Representatives. The first session must be opened by themonarch in person by reading aSpeech from the Throne. This ceremony is held in theAnanda Samakhom Throne Hall. The monarch may also appoint a representative to carry out this duty. It is also the duty of the monarch to prorogue sessions through aroyal decree when the House term expires. The monarch also has theprerogative to call extraordinary sessions and prolong sessions at his discretion.
The National Assembly may host a "joint-sitting" of both houses under several circumstances. These include the appointment of a regent; any alteration to the1924 Palace Law of Succession; the opening of the first session; the announcement of policies by theCabinet of Thailand; approval of adeclaration of war; the hearing of explanations and approval of atreaty; and the amendment of the constitution.
Members of the National Assembly enjoyparliamentary privileges, enshrined in the constitution. These include the "words expressed in giving statements of fact or opinions or in casting the vote" in a joint session of the National Assembly; no member of the House of Representatives or Senate shall, during a session, be arrested, detained, or summoned by a warrant for an inquiry as the suspect in a criminal case unless permission of the house of which he or she is a member is obtained or he or she is arrested inflagrante delicto.
The two houses also retain the privilege to decide its own rules and procedures,committees,quorum of committees, sittings, the submission and consideration of organic law bills and bills, the submission of motions, the consultation, debates, the passing of a resolution, the recording and disclosure of the passing of a resolution, the interpellation, the initiation of a general debate and committee members.


From 28 June 1932 to 1974, the legislature met in theAnanta Samakhom Throne Hall. After the first elections to the National Assembly in 1933, KingPrajadhipok gave the Throne Hall for the legislature's use. However, through the years the composition of the Assembly increased and the Throne Hall became too small to accommodate all the legislators and its secretariat. Three attempts were made to build a new building. Each failed because the government in power was terminated before a budget could be appropriated.
The fourth time, however, was a success, with the help of KingBhumibol Adulyadej who appropriated to the National Assembly royal land immediately north of the Throne Hall for the site of the new Parliament House. Construction began on 5 November 1970, with a budget of 51,027,360 baht. The new Parliament House complex is composed of three buildings:
Parliament House was first used on 19 September 1974. The Ananta Samakhom Throne Hall became a national historic building and was returned to the king as part ofDusit Palace. From then on Parliament House became the primary building used for the National Assembly. Only the state opening ceremony is now held in the Throne Hall.
On 29 July 2008, the National Assembly appropriated new funds to construct a new and grander Parliament House. As of December 2008, a site belonging to theRoyal Thai Army was identified as the site of a new complex, but no further action has been taken.
In 2013, the National Assembly confirmed that it would be moved to the new Parliament House,Sappaya-Sapasathan.

Prior to 1932, the Kingdom ofSiam did not possess a legislature, as all legislative powers were vested in the person of themonarch. This had been the case since the foundation of theSukhothai Kingdom in the 12th century, as the king was seen as a "Dharmaraja" or "king who rules in accordance withDharma" (the Buddhist law of righteousness). However, on 24 June 1932 a group of civilians and military officers, calling themselves theKhana Ratsadon (or People's Party) carried out abloodless revolution, in which the 150 years ofabsolute rule of theHouse of Chakri was ended. In its stead the group advocated aconstitutional monarchy with an elected legislature.
The "Draft Constitution" of 1932 signed by KingPrajadhipok, created Thailand's first legislature, a People's Assembly with 70 appointed members. The Assembly met for the first time on 28 June 1932, in theAnanda Samakhom Throne Hall. The Khana Ratsadon decided that the people were not yet ready for an elected assembly, then later changed their minds. By the time the "permanent" constitution came into force in December of that year, elections were scheduled for 15 November 1933. The new constitution changed the composition of the Assembly to 78 directly elected and 78 appointed (by the Khana Ratsadon), together totalling 156 members.
After theSecond World War a new constitution was promulgated in 1946 under the government ofPridi Panomyong. The constitution is considered Thailand's most democratic and created for the first time a bicameral legislature: a Senate and a House of Representatives. Also for the first and last time, the constitution called for a fully elected Senate (albeit indirectly) and House. The Senate to a six-year term and the House to four years. The ban onpolitical parties was lifted and the first full elections were held in 1946. However, in 1947 acoup d'état by the military abrogated the constitution and replaced it with the 1947 "temporary" and then a "permanent" charter in 1949. The new constitution retained the House but created a 100-member Senate directly appointed by theking.
On June 5, 1949,Orapin Chaiyakan became the first woman to be elected to hold a post in the National Assembly of Thailand (specifically, theHouse of Representatives.[25][26])
This charter lasted until 1957 when the military again carried out a coup d'état and created a single 123-member appointed National Assembly, 103 of which were from the military or police. In 1959Field MarshalSarit Thanarat carried out anothercoup d'état this time abolishing the National Assembly altogether. In 1969 underThanom Kittikachorn the National Assembly returned, this time with a 219-member House and again a royally appointed Senate. This lasted until 1972 when Thanom overthrew his own government and ruled the country through a National Executive Council. Under pressure Thanom reinstated a 299-member appointed National Legislative Assembly, 200 which were members of the military.
In 1973, the rule of the "three tyrants" (as Thanom's tenure became known) was finally overthrown. A new constitution was promulgated, this time swinging the power back to the legislature by creating a bicameral legislature with an elected House and a House-appointed Senate. Within two years the military led byThanin Kraivichien again abrogated the constitution and installed a royally-appointed 360-member unicameral National Assembly.
By 1978,Kriangsak Chamanan (who succeeded Tanin in 1977) restored the bicameral legislature with an elected 301-member House and a 225-member Senate appointed by the prime minister. This arrangement lasted for almost 13 years untilArmy Commander GeneralSuchinda Kraprayoon overthrew the government ofChatichai Choonhavan in 1991 and returned the unicameral appointed National Assembly with 292 members. However, Suchinda's rule was brought down by theBlack May uprising, which led to the overthrow of the military and the drafting of a new constitution.

TheConstitution of 1997 or the "People's Constitution", returned Thailand to democracy with a National Assembly composed of an elected 500-member (400 directly, 100 by party-lists) House of Representatives, and an elected 200-member Senate. This arrangement lasted for almost ten years. The constitution was abrogated following the2006 Coup d'état by the military under GeneralSonthi Boonyaratglin. In 2007, the military appointedNational Legislative Assembly to draft thenew constitution. This copy was eventually adopted after it was approved through areferendum in 2007. This constitution was abrogated at the end of 2013 with the fall of theYingluck Shinawatra government. As of 2016, the country is governed by the2014 interim constitution of Thailand. Areferendum on a new constitution is held in August 2016.[27] After it was approved through areferendum in 2016, on 6 April 2017new constitution is officially endorsed by His Majesty the KingVajiralongkorn in the ceremony of promulgation for the2017 constitution.[28]
| The Senate | The House of Representative | ||||
|---|---|---|---|---|---|
| The President | The Speaker | The Prime Minister | The Leader of the Opposition | ||
| 1st Vice-President | 2nd Vice-President | 1st Deputy-Speaker Chaiya Phromma | 2nd Deputy-Speaker Chalat Khamchuang | Deputy Prime Ministers
| |