To provide an intermediate substrate 1 for an FRP structure which is excellent in dimensional stability and handling properties and the intermediate substrate 1 of the FRP structure which can obtain excellent FRP physical properties to a molding end.

In the intermediate substrate for the FRP structure, the intermediate substrate is made of a laminate 1 in which cut reinforcing fiber fabrics are laminated, a cut part lamination end surface formed by arranging/laminating the cut parts 6a of the fabrics is formed in a part of the intermediate substrate, and a cutting part 5 which moves from the fabrics around the cut part lamination end surface and surrounds the end surface is formed.