國際法院成案中的禁反言原則之運用

禁反言原則在國際公法中是一個相對來說困難的概念，其真實的意涵一直都是倍受討論。進一步來說，理解禁反言原則之困難或艱深之處在於，其與其他的國際法原則有非常複雜的牽連關係，例如默認、誠信原則以及自我認諾。即使如此，禁反言原則是有著獨特的重要性，不僅是在國際公法的法理層面，其重要性也突顯在禁反言原則在國際爭端解決的運用中。本論文特別進行對於禁反言原則在國際爭端解決中的運用脈絡，藉此釐清其在國際公法的案件中之獨特性，相關案件例如西班牙國王仲裁案，以及泰國與柬埔寨的寺廟主權案，以及緬因灣案件。最後本論文總結，看到從過去的國際司法實踐中證明禁反言的彈性，而即使如此，其仍然是一個在國際爭端解決中有特別用處的一個重要法律概念。

關鍵字

禁反言；國際法院；誠信原則；默認；承認；認諾

並列摘要

The principle of estoppel, from the perspective of international law, is a difficult one to understand its true content. Furthermore, this principle is further complicated with other international law principles such as acquiescence, good faith or self-admission. Nonetheless, the principle of estoppel is of crucial importance in the jurisprudence of international law, and it is particular useful in terms of international dispute settlement. Hence, this paper intends to examination of application of principle of estoppel in the jurisprudence of international adjudication. This paper examines the application of the principle of estoppel in leading international cases such as King of Spain Arbitral Award case, Temple of Preah Vihear case, Gulf of Maine case etc. And this paper concludes that past practice of international adjudication proves that, albeit a flexible one, principle of estoppel is practically a useful tool in international dispute settlement.