This paper is a part of the researches to characterize and identify the architectural theory of Jun Itami (1937-2011) through all the currently available articles written by him. The keywords of the subjects were sorted out as a number of items and examined from the viewpoint of hierarchy of composition of the meaning by extracting important sentence. As the first level of his architectural thought, three items of 【Joseon period】, 【Korea】, 【Contemporary Japan】 were extracted. This paper is examining 《Nature》,《Human Spirit》, and 《City》 that make up【Contemporary Japan】. 《Nature》consists of the third level of three items of［Natural objects］, ［Natural environment］, and ［The role of nature］. ［Natural objects］ consists of the 4th level of four items of 〈Water〉, 〈Wood〉, 〈Stone〉, and〈Soil〉. ［Natural environment］ consists of the 4th level of seven items of 〈Magnificence〉, 〈Environment〉, 〈Face〉, 〈Light〉, 〈Wind〉, 〈Sound〉, and 〈Sky〉. ［The role of nature］ consists of the 4th level of five items of 〈Harmony〉, 〈Antagonist〉, 〈Fusion〉, 〈Coexistence〉, and 〈Multi-layered〉. 《Human spirit》 consists of the third level of five items of ［Perceptual structure］, ［Changing to the line of sight］, ［Art］, ［Drawing］, and ［Parthenon temple］. ［Drawing］ consists of the 4th level of five items of 〈Physicality〉, 〈Layering and blocking〉, 〈Primitive experience〉, 〈Tuning〉, and 〈The significance of contemporary drawing〉. 《City》 consists of the third level of two items of ［Life in the city］, and ［Architecture in the city］.

　In 【Contemporary Japan】, industrialization and internationalization are progressing, various spatial and temporal boundaries are fading, everyday life and 《Architecture》 itself continue to change day by day. Human beings are being isolated from 《Nature》, 《Architecture》, and 《City》.

　While presenting an awareness of the problem of 《City》, he examined various ways of the relationship between 《Nature》 and 《Architecture》, and found and explained the concept of 〈Face〉and［Perceptual structure］ in his own word.