This paper aimed to clarify the concrete situation of introduction and development of imitation tree, imitation stone, and imitation rock as modern landscape material in and around Osaka and Hanshinkan area. As the results of documents analysis and field survey, this paper led the following. There are: Imitation tree had introduced into this area around the end of Taisho era. About introducing imitation tree, landscape architect SHIIHARA Hyoichi, Landscape engineer HASHIMOTO Yaezo and KOBAYASHI Kanzan had played an important role. In the early Showa era, imitation tree, imitation stone, and imitation rock were being used widely in residential gardens and public parks in Osaka and Hanshinkan area. Imitation tree were used for garden furniture as arch, bench, bridge, and so on. Imitation stone were used for stone arrangement of waterfall and mound. Imitation rock were used for animal’s pasturage exhibition facilities they are monkey mountain and polar bear cage. These were designed and constructed by landscape architect and landscape engineer of the above three. Also, it was found that the modern plutocrat NITTA Chojiro introduced garden furniture made of imitation tree and rock arrangement consisted of imitation stone into his residential garden in Koshien area of Nishinomiya, Hyogo Prefecture.