Legal Analysis of the Principle of Mistake in Thai Law

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Chavanya Suiadee

Abstract

When examining Sections 156 to 158 which pertains to the principle of mistake under Thai law, a question arises as to the adequacy of such three existing provisions in tackling current problematic situations.


There are two types of mistakes as enshrined in the Thai Civil and Commercial Code (the CCC), namely, a mistake of an essential element of a juristic act resulting in voidness as per section 156, and a mistake of a quality of a person or of the property that is deemed as an essential element of the juristic act resulting in voidability as per section 157. Apparently, these two provisions provide protection to the mistaken party to preserve the actual will. Hence, this is a reflection of the subjectivity, rather than the objectivity, principle at play. There is only one exception in the case of gross negligence pursuant to Section 158 to protect the other bona fide party which is inadequate to maintain the trust between parties and would lead to injustice and uncertainty of commercial.


Therefore, the author has conducted a comparative study to analyze the principle of mistake which includes English law, French law, and the UNIDROIT Principles of International Commercial Contracts 2016. Accordingly, the author proposes additional conditions and exception for nullification or avoidance of a bilateral juristic act which is similar to Article 3.2.2 of the UNIDROIT principles. In so doing, the principle of mistake in Thai law would be more fair and compatible with the current state of the economy.

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