Article 421: Abuse of right, bad-faith use
Statutory text (Thai original)
การใช้สิทธิซึ่งมีแต่จะให้เกิดเสียหายแก่บุคคลอื่นนั้น ท่านว่าเป็นการอันมิชอบด้วยกฎหมาย
Verbatim from the Royal Gazette / Office of the Council of State
English translation
The exercise of a right which can only have the purpose of causing injury to another person is unlawful.
This English translation is provided for reference only and has not yet been firm-verified. Always rely on the Thai original.
Firm annotation
Section 421 is the close cousin of §5 (good faith) but in the tort chapter. It catches exercises of right where the dominant intent is to injure rather than to obtain any legitimate benefit. Classic Thai applications: a neighbour building a spite fence; a litigant filing a baseless action solely to drain the opponent; an employer terminating an employee on a technicality after the employee has reported wrongdoing. Note: §421 doesn't reach exercises of right that are merely insensitive, the plaintiff must show the dominant purpose was harm.
Why this matters in practice
Lawyers: Section 421 applies only where the right-holder has no genuine legitimate interest in the exercise and the sole purpose is to harm the other party. Courts apply this doctrine narrowly. A landowner who builds on or uses their own land in a way that incidentally harms a neighbour is not automatically liable, the plaintiff must show the action served no legitimate purpose of the right-holder. Laypersons: Even if someone technically has a legal right, using it solely to hurt you with no benefit to themselves can still be unlawful: but this is very difficult to prove.
Legislative history
Part of the original Civil and Commercial Code codification; no major subsequent amendment.
Décisions de la Cour suprême interprétant cette section
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Arrêt de la Cour suprême n° 2573/2554 (2011)
Building on one's own land in a dense urban development, where the neighbour could reasonably expect such building, is a normal and justified exercise of a right. It is neither the exercise of a right that can only have the purpose of injuring another under section 421 nor a cause of disturbance beyond what should be expected under section 1337.
A subdivision developer that has impliedly represented that the plan's roads will be provided must maintain them, as they are public utilities burdened by a servitude. But the disputed road lay in the part of the land the developer never used or built on and never in fact offered for sale, which had stood empty for twelve years with concrete blocks across its entrance and no lot owner objecting, so it was not burdened by a servitude at all. When the developer sold that land to defendant 1, who built a solid concrete wall about three metres high on his own land behind the plaintiff's shophouse, the Court held this was a normal and justified exercise of rights in a dense commercial district, which the plaintiff should have expected, and not a tort under sections 421 and 1337.
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Arrêt de la Cour suprême n° 8027/2546 (2003)
Section 421 does not apply where the plaintiff has not suffered special damage different from the general public; a private claimant cannot use section 421 to enforce rights against occupation of public land absent special prejudice.
The defendant occupied a strip of public land between the plaintiff's land and a public road by planting trees and building a bathroom. The plaintiff's land had not originally abutted the road, so the plaintiff had no prior access right across the public strip. The Court held this was not a case for section 421 (or section 1337): the plaintiff had not suffered special damage different from the general public, and the defendant's occupation of public land: while unlawful vis-à-vis the state: did not give the plaintiff a private cause of action for abuse of rights.
Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.
Cité dans 95 décisions de la Cour suprême (1949 à 2025)
Décisions de citation sélectionnées
- Decision 1534/2565 (2022)
- Decision 4776/2564 (2021)
- Decision 8293/2559 (2016)
- Decision 6599/2559 (2016)
- Decision 11753-11754/2557 (2014)
- Decision 15674/2555 (2012)
- Decision 12973/2555 (2012)
- Decision 8956/2554 (2011)
Cette liste est sélectionnée automatiquement, en privilégiant les jugements qui reposent sur cet article plutôt que sur ceux qui se contentent de le citer lors du prononcé de la peine. Elle n'a pas encore été examinée par le cabinet.
Le plus souvent cité aux côtés de
- Article 420 32
- Article 1337 20
- Article 18 12
- Art. 142 du Code pénal thaïlandais 6
- Section 5 6
- Article 1304 4
Sections qui apparaissent le plus souvent dans les mêmes jugements que celui-ci. Le chiffre correspond au nombre de décisions.
Calculé sur l'ensemble du corpus de 83 652 décisions de la Cour suprême du cabinet, de 1921 à 2026. Le décompte est exhaustif ; la plage d'années indiquée élimine les valeurs aberrantes rares afin de refléter la répartition réelle des citations. Ces chiffres sont calculés par nos soins et ne constituent pas des statistiques officielles de la Cour. Comment nous les comptons et ce que nous avons mesuré
Guides connexes sur ThaiLawOnline
Citer cette section
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Citation simple
Civil and Commercial Code, s. 421 (Thailand) -
Citation académique
Civil and Commercial Code (Thailand), s. 421. ThaiLawOnline, https://www.thailawonline.com/fr/thai-civil-code/section-421/ (accessed 30 août 2026). -
Citation thaïlandaise
ป.พ.พ. มาตรา 421 -
Lien permanent
https://www.thailawonline.com/fr/thai-civil-code/section-421/ -
Intégrer sur votre site
<blockquote cite="https://www.thailawonline.com/fr/thai-civil-code/section-421/"><p>L'exercice d'un droit qui ne peut avoir d'autre but que de nuire à autrui est illégal.</p><footer>Civil and Commercial Code, s. 421 (Thailand): <a href="https://www.thailawonline.com/fr/thai-civil-code/section-421/">ThaiLawOnline</a></footer></blockquote>
The Thai text is authoritative. The English is an unofficial translation by ThaiLawOnline, free to reuse with attribution.