Abstract
The purpose of this paper is to find out the law of Kafu Nagai's mental activity. The author took the method of analyzing his diary "Saiyuunisiisyou" in his overseas life and reconsidering the balance between his life and spirit. As a result, the following was found. Kafu Nagai puts writing activities first, and when he cannot devote himself to it, he tends to feel guilty. Also, his father has a strong influence on his life, and he is more likely to choose a liberal life to escape from it.The life and writings of Ogai Mori, whom he respects, had a strong influence on the way he lived. Under the above conditions, his spirit grew as he patrolled between a life centered on writing activities and a free-spirited life in a circular motion.
