In recent years, the social demand toward ecological aspect of coastal area has been increasing. However, very little things have been known about the relationship between ecosystem and coastal environment. The objective of the present study is to investigate the transition of algae community on artificial reefs after construction, and the relationship between algae community on artificial reefs and intensity of wave-induced current around artificial reefs is discussed. It is concluded that the algae community on the artificial reefs on Takada Coast is influenced by the intensity of the wave-induced current around the artificial reef. Thus it might be possible to construct a naturefriendly artificial reef by using the relationship between algae community and wave-induced current revealed herein.