Siam managed to replace royal absolutism with limited monarchy in June 1932 without any chaos or bloodshed. But the transition quickly proved to be far from complete. The country was to undergo a major upheaval before suffering a semi-civil war only about a year after the princely rule was toppled. The new regime, accordingly, began to consider its constitution as a symbol behind which the people could be mobilized. A massive campaign for the document was then launched in late 1933 and it soon culminated in what can be regarded as the practice of constitution worship. This article will look at the campaign in detail, especially with respect to its underlying logics; the aim is to reveal and analyse the attempt by the revolutionary regime to transform the first permanent constitution into a sacred entity. Meanwhile, in pursuing such an aim, this article will shed light on the formation of a constitutional culture in Siam. Given that a basic law had never existed in the country, the article will discuss not only how the state promoted the permanent constitution, but also how the Siamese society encountered and experienced constitutional rule for the first time.