Okubo Koreatown in Shinjuku-ward, an ethnic town located in the inner city of Tokyo, has been formed mainly since the 1990 s with an increasing number of Koreans, and the area started to become a tourist destination for Japanese since 2004. Although Kabukicho, known as Japanese night-life district, is located next to Okubo, the relationship between these two areas has not been explored in previous research. Therefore, this study examines how the geographical scale in the daytime differs from that in the nighttime, by examining the bordering area between Okubo ethnic town and Kabukicho night-life district.