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Thailand adopts a democratic regime of government with the King as Head of State. (Sec. 2)

Subject to section 21, the succession to the Throne shall be in accordance with the Palace Law on Succession, B.E. 2467 (1924). … (Sec. 20)

The King is a Buddhist and Upholder of religions. (Sec. 7)

… The National Assembly, the Council of Ministers, Courts, Independent Organs and State agencies shall perform duties in accordance with the Constitution, laws and the rule of law for the common good of the nation and the happiness of the public at large. (Sec. 3)

A Minister must:
1. be of Thai nationality by birth;
2. be not less than thirty-five years of age;
3. have graduated with not lower than a Bachelor’s degree or its equivalent;
4. be of evident integrity;
5. not have behaviour which is a serious violation of or failure to comply with ethical standards;
6. not be under any of the prohibitions under section 98;
7. not be a person sentenced by a judgment to imprisonment, irrespective of the finality of the case or a suspension of the punishment, except for an offence committed through negligence, a petty offence or a defamation offence;
8. not be a person whose office has been vacated on the grounds of committing any prohibited act under section 186 or section 187, for a period of less than two years up to the date of appointment. (Sec. 160)

The House of Representatives shall complete its consideration for approval of the person suitable to be appointed as Prime Minister from a person who has the qualifications and is not under any of the prohibitions under section 160, and is a person listed by a political party under section 88, only with respect to the list of names of political parties whose members have been elected as Members of the House of Representatives constituting not less than five per cent of the total number of existing Members of the House of Representatives. ... (Sec. 159)

The King appoints the Prime Minister and not more than thirty five other Ministers to constitute the Council of Ministers having the duties to carry out the administration of the State affairs in accordance with the principle of collective responsibility.
The Prime Minister must be appointed from a person who is approved by the House of Representatives under section 159. ... (Sec 158)

Members of the House of Representatives who are elected on a constituency basis shall be elected by direct suffrage and secret ballot. ... (Sec. 85)

There shall be the following organic acts:
1. Organic Act on Election of Members of the House of Representatives;
2. Organic Act on Installation of Senators;
… (Sec. 130)

The House of Representatives consists of five hundred members, as follows:
1. three hundred and fifty members elected on a constituency basis;
2. one hundred and fifty members from party lists of political parties.
In the case where the office of a Member of the House of Representatives becomes vacant for any reason, and an election of a Member of the House of Representatives has not been held to fill the vacancy, or no declaration of name of a Member of the House of Representatives has been made to fill the vacancy, the House of Representatives shall consist of the existing members of the House.
In the case where there is any reason for the number of the Members of the House of Representatives by party list basis to be fewer than one hundred and fifty persons, the Members of the House of Representatives by party list basis shall consist of the existing members. (Sec. 83)