The studies of Japanese Intellectual History was born after the 1st World War when Japan occupied the position to confront the West in the world history. In this period, Japan expanded its influence in Southeast Asia. How to establish the national identity of ‘Japan’ was the research task of Japanese Intellectual History. This paper thinks about the meanings of the studies of Japanese Intellectual History by considering the birth, main issues, and the direction of the studies of Japanese history of thought. One of the huge characteristics of researches on the Japanese Intellectual History First, it is the period of a shift in generations. On top of the retirement of the 1st-generation researchers such as Maruyama and Goyas in the postwar period, their younger scholars also faced the period of retirement. Second, it is the researches the history of thought without a view of history. The researches on the Japanese history of thought after Maruyama certainly showed its external expansion such as the expansion of research materials, close reading of historical records, cross-sectional research on the studies of Japanese Intellectual History and neighboring studies, criticism of modern knowledge, criticism of researches in the viewpoint of single-national history, and expansion to the East Asian history of thought. However, there is no distinct view of history including the researches on the history of thought. Thus, there are no researches aiming to suggest the whole image of studies on the history of thought. Third, the theme of researches on the history of thought is moving to modern times. Fourth, the researches on the Japanese history of thought are locked in a viewpoint of single-national history. It would be necessary to review the characteristics of Japanese Intellectual History in correlations of China, Joseon, and Japan.