芥川龍之介（Akutagawa Ryunosuke）1921年到中國旅行；〈馬腳〉是1925年（大正14年）發表的小說。〈馬腳〉的男主角忍野半三郎（Oshino Hanzaburou）到中國北京工作後，陰錯陽差被鬼差點錯生死簿，猝死在工作地點。鬼差發現抓錯人時，不得已匆忙地幫腳已爛掉的男主角，裝上一雙馬腳後，隨之讓他復活。討厭馬的男主角，身體變成嵌合體（chimera），駕馭不了自己的馬腳，且受到原生馬蒙古馬的牽引，脫離家庭，奔馳在滾滾黃沙中，飄流不定。因此，本小論試從男主角的身體改變，和所處的空間變化，探討男主角的主體性，以及〈馬腳〉中呈現的意識形態。

Akutagawa Ryunosuke had a trip to China in 1921, while "Umanoashi" is a novel published in 1925.The hero Oshino Hanzaburou in "Umanoashi" was mistakenly put in the death book by the inferno servant and had a sudden death out of his hometown. After the servant had been aware of the mistake, he could only immediately replace the hero's rotten leg with a horse leg and brought him back to life. The hero who had really hated horses then had a body of "chimera." He could not control his own horse leg but was dragged by the original Mongolia horse to separate himself from his own family galloping in the flowing sand of deserts, not knowing where to go. Hence, this paper tries to discuss the hero's subjectivity and the ideology in "Umanoashi" with the hero's physical change.