In this paper, Taro Okamoto examined the Korean folk art which he experienced through two trips to Korea in 1964 and 1977, in conjunction with his artistic theory. The subjects of particular interest to him were Tegum of traditional instruments, Janson, masks, traditional costumes and so on. Although they are subjects of ethnology, they are closely related to his work of art. For example, the mask used in mask play (Taltsyum) reminds me of a face that was an indispensable theme in Taro. In the 1970 Osaka World Expo symbol "The Tower of the Sun" it is also necessary to recall that the masks of the former world as well as the masks he made directly were lined up. The combination of vivid primary colors, especially red and blue, which Taro saw from Korean traditional costumes is also the coloring he liked with his own paintings. Jangsun of Korea communicates with the universe through a pillar connecting the earth and the sky. There are many things in common with Taro`s artistic theory that "Taltsyum" of the mask play has a pleasant embody of Homoldens rooted in life (human being playing). The dynamism of Jangsung and masked play appears in Taro`s picture with many stripes and patterns that face from the inside to the outside. Taro encountered the beauty of Korean folk art in the process of finding ways to overcome the Japanese framework of the modern nation and create a new beauty tradition. It provided various hints important to his artistic theory. I can say that Taro met "a fun universe with the art of everyday" through Korean folk art.