Constitution Day on 10 December Every Year: Complete History and Summary

Constitution Day It is one of the important days for Thai people because it reminds them of the significance of the constitution, the supreme law governing the country, as well as the change in the nation's form of government. What is Constitution Day? Is it a public holiday? Follow the history and interesting facts here.

Understanding "Constitution Day": What is it, and on what date does it fall?

Constitution Day 2025 (English: Constitution Day) falls on 10 December 1932, an important day in Thailand established to commemorate the event when His Majesty King Prajadhipok (Rama VII) granted the first permanent constitution to the Thai people.

History and origins of Constitution Day

Constitution Day was established after Thailand transitioned from an absolute monarchy to a parliamentary democracy on 24 June 1932, when King Prajadhipok (Rama VII) proclaimed the temporary constitution of Siam. Three days later,

on 10 December 1932, he granted the “Constitution of the Kingdom of Siam 1932,” the first permanent constitution of Thailand. To date, Thailand has promulgated a total of 20 constitutions, as follows:

• Temporary Constitution of the Kingdom of Siam 1932
• Constitution of the Kingdom of Siam
• Constitution of the Kingdom of Thailand 1946
• Temporary Constitution of the Kingdom of Thailand 1947
• Constitution of the Kingdom of Thailand 1949
• Amended Constitution of the Kingdom of Thailand 1932, amended in 1952
• Constitution of the Kingdom 1959
• Constitution of the Kingdom of Thailand 1968
• Constitution of the Kingdom 1972
• Constitution of the Kingdom of Thailand 1974
• Constitution of the Kingdom of Thailand 1976
• Constitution of the Kingdom 1977
• Constitution of the Kingdom of Thailand 1978
• Constitution of the Kingdom 1991
• Constitution of the Kingdom of Thailand 1991
• Constitution of the Kingdom of Thailand 1997
• Temporary Constitution of the Kingdom of Thailand 2006
• Constitution of the Kingdom of Thailand 2007
• Temporary Constitution of the Kingdom of Thailand 2014
• Constitution of the Kingdom of Thailand 2017

Why is Constitution Day important?

Besides commemorating the first permanent constitution of Thailand, Constitution Day also serves the following purposes:

• Establishing state authority: symbolizing sovereignty.
• Setting the direction of society: creating unity and showing the intent of the government’s path by defining duties, roles, and mechanisms of political institutions.
• Protecting citizens' rights and freedoms: guaranteeing fundamental rights and liberties under the constitution.
• Confirming the legitimacy of the political system: a constitutional state gains acceptance and legitimacy both domestically and internationally.

Is Constitution Day a holiday for banks and private companies?

Constitution Day falls on 10 December every year. It is a government public holiday and a bank holiday, but it is not a statutory holiday for private companies, which depends on each company's policy.

Constitution Day is another significant day in Thai history, when people remember the importance of establishing the constitution. On this day, various activities are held, such as official wreath-laying ceremonies by government agencies, national flag displays on buildings and homes, and educational events at schools and institutions.