Section 30
Statutory text (Thai original)
การใด ๆ อันบุคคลวิกลจริตซึ่งศาลยังมิได้สั่งให้เป็นคนไร้ความสามารถได้กระทำลง การนั้นจะเป็นโมฆียะต่อเมื่อได้กระทำในขณะที่บุคคลนั้นจริตวิกลอยู่ และคู่กรณีอีกฝ่ายหนึ่งได้รู้แล้วด้วยว่าผู้กระทำเป็นคนวิกลจริต
Verbatim from the Royal Gazette / Office of the Council of State
English translation
An act done by a person of unsound mind but not adjudged incompetent is voidable only when the act was done at a time he was actually of unsound mind, and the other party had knowledge of such unsoundness.
This English translation is provided for reference only and has not yet been firm-verified. Always rely on the Thai original.
Firm annotation
Section 30 is part of Book 1 (General Principles) of the Thai Civil and Commercial Code. This entry is awaiting firm-authored commentary; the statutory text above is verbatim from the Office of the Council of State (OCS Krisdika) Thai source, with the English translation from the FAO/UN FAOLEX repository. Always rely on the Thai original for legal proceedings.
Cited in 12 Supreme Court decisions (1947 to 2024)
Selected citing decisions
- Decision 2558/2567 (2024)
- Decision 2522/2560 (2017)
- Decision 2587/2545 (2002)
- Decision 2894/2519 (1976)
- Decision 297/2502 (1959)
- Decision 2319/2542 (1999)
- Decision 5466/2537 (1994)
- Decision 4549/2536 (1993)
This list is selected automatically, weighted towards judgments that turn on this section rather than ones that merely recite it when passing sentence. It has not yet been reviewed by the firm.
Most often cited alongside
Sections that appear in the same judgments as this one most often. The figure is the number of decisions.
Counted across the firm's corpus of 83,772 Supreme Court decisions, 1921 to 2026. These figures are computed by us and are not official court statistics.
Related guides on ThaiLawOnline
Cite this section
-
Plain citation
Civil and Commercial Code, s. 30 (Thailand) -
Academic citation
Civil and Commercial Code (Thailand), s. 30. ThaiLawOnline, https://www.thailawonline.com/thai-civil-code/section-30/ (accessed 8 August 2026). -
Thai citation
ป.พ.พ. มาตรา 30 -
Permalink
https://www.thailawonline.com/thai-civil-code/section-30/ -
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<blockquote cite="https://www.thailawonline.com/thai-civil-code/section-30/"><p>An act done by a person of unsound mind but not adjudged incompetent is voidable only when the act was done at a time he was actually of unsound mind, and the other party had knowledge of such unsoundness.</p><footer>Civil and Commercial Code, s. 30 (Thailand) — <a href="https://www.thailawonline.com/thai-civil-code/section-30/">ThaiLawOnline</a></footer></blockquote>
The Thai text is authoritative. The English is an unofficial translation by ThaiLawOnline, free to reuse with attribution.