To provide an epiphytic substrate unit for marine life that can be switched to a new epiphytic surface with good workability by constant peeling operation without the occurrence of peeling in an actual state and without replacement work and cleaning work in renewal work, and facilitates management on usage, and also can be used for various kinds of marine life for performing epiphytic growth with simple and low-cost configuration, and provide an artificial marine structure.SOLUTION: An epiphytic substrate unit 1 for marine life is provided with an epiphytic substrate body 2 having an epiphytic surface B to a substrate 3 enabling epiphytic growth of the marine life. The epiphytic substrate body is formed by overlapping multiple epiphytic substrate plates 4 with plate surfaces 4a serving as the epiphytic surfaces, and being integrally connected and laminated by binder layers for lamination provided in the interval between these epiphytic substrate plates. The epiphytic substrate body and the substrate are integ
