近年來日本作家東野圭吾不僅是在日本甚至是在台灣，不分男女，他的作品都受到廣大的支持與喜愛。因此本論試圖分析東野圭吾的魅力所在？另外東野圭吾推理小說中的頭號人物加賀恭一郎，總是令人留下深刻的印象。《加賀恭一郎系列》甚至多數被改編成為膾炙人口的電視劇及電影。並引發廣大的回響。可以想見東野圭吾的推理小說能維持居高不下的人氣，加賀恭一郎的功不可沒。因此本論將以系列人物加賀恭一郎為研究對象，來分析東野圭吾筆下所描繪的系列人物究竟是何種樣貌。透過加賀恭一郎東野圭吾想帶給讀者甚麼樣的啟發。 本論文將分成五個部分，首先將敘述本論的研究動機及目的。接下來在第一章中將分析東野圭吾的作品，整理出東野圭吾推理小說的特色。接下來第二章將比較東野圭吾作品中，各個時期的變化。第三章將加入分析加賀恭一郎系列的風格變化。並且在第四章中挖掘東野圭吾作品風格轉變的各式原因。藉由以上的步驟，相信便能對東野圭吾筆下所描寫的系列人物，有更進一步的了解。 In recent years, Japanese writer Keigo Higashino is very well known not only in Japan but also in Taiwan. Most of the people enjoy his stories. As a result, in this thesis we try to analysis of the reasons behind success of Keigo Higashino? And also we can see that people always been impressed by the detective of Kyoichiro Kaga in Keigo Higashino’s famous books. There are lots of " Detective Kaga Series" have been adapted to screen and becoming popular TV drama and movies. Therefore we can mention that Keigo Higashino cannot develop a success without the protagonist of Kyoichiro Kaga. Focusing on the " Detective Kaga Series", this thesis attempt to explore the image of the detective which depicted by Keigo Higashino. The thesis will be divided into five parts, in the first part it indicates motivation and purpose. The next chapter will compare the works of Keigo Higashino with various periods. Next we try to analysis the works of Keigo Higashino and find out the style of his books. Chapter three we attempt to explored the changing characteristics of Detective Kaga and the reasonable meaning. Finally, we try to find out the link between Keigo Higashino and Kyoichiro Kaga. By these steps, we believe that will be able to explore the image of the detective which depicted by Keigo Higashino.