Nearshore ecosystems are characterized by the prominence of foundation species such as seagrass beds, mangrove forest, coral reefs and kelp/sargassum beds.The associated organisms such as marine invertebrate and fish species normally have wide spatial distribution and use multiple habitats including various foundation species in their life cycles. Therefore, seascape structure and spatial extent including multiple habitats would be important for the production, biomass and diversity of the associated organisms. This study examined spatial classification of the suitable seascape structure for the coastal fish species in Seto Inland Sea using GIS. The spatial analysis detected the areas closely around Seagrass/Sargassum (SS) habitats as the most suitable seascape for black rock fish. This is presumably because the juveniles recruit within SS areas, and because the adults also visit these areas for foraging even after they changed their main habitats to offshore areas. For red sea bream and Japanese flounder, the analyses extracted the areas with deep sandy and muddy bottoms adjacent to SS habitats as the most suitable seascape. Our results give a reliable evidence that various coastal fishes with various life histories are closely related with SS habitats.