本報告分析「異人買寶譚」的誕生、變遷與世界認識的變遷之關係。異人買寶譚屬於異人來訪並識別發現被埋沒的寶物並予以購買之情節類型的民間故事。本報告首先在第一節中，廣泛收集大量記錄該故事的唐代之事例，分列為一覽表，整理出故事結構中固定的類型。接著在第二節中，選取故事中可變性因素，探討唐代的異人買寶譚之特徵，指出八、九世紀以後，越來越多來到中國城市的外國商人之活動構成了唐代異人買寶譚流傳的重要背景。最後在第三節中，基於中國大陸中的世界認識變遷之模式，嘗試分析通過異人買寶譚對來到中國大陸的中國大陸外部的人們賦予「回回」、「洋人」等異人之名稱，創作並流傳非漢人探尋漢人社會內部的寶物這一故事，而在居住於中國大陸的人們之間逐步形成「漢人」這一同類意識的過程。具有敘述眾神世界與人間之間的交流這一神話性、宇宙論性結構的異人買寶譚的情節類型，因中國大陸的內外情勢之變化與世界認識之變遷而轉變為通過強調共同體外部之存在，來樹立共同體內部的同類意識的情節類型，成為促使自我意識到漢人社會之存在，強化其紐帶地以人間為中心的民間故事。

The purpose of this presentation is to analyze the transformation and the social background of a group of folktales in which a foreigner visits a city or village to find and buy an unknown treasure. This type of folktale became widespread in China from the fourth and fifth centuries to the twentieth century. In this paper, I will interpret the hidden meaning and the historical background of the folktale. The folktale had a mythological and cosmological structure and functioned as on intermediary between the gods and human beings. However, the folktale began to secularize and the meaning of the story changed after the ninth and tenth centuries in accordance with international and domestic social changes. I will analyze the process and factors of the change in function and structure of the folktale.