To manufacture a three-dimensional fiber reinforced composite material at a low cost.

An x yarn layer 4 and a y yarn layer 5 formed by arranging continuous fibers in one direction are mutually multi-laminated and form a laminated fiber group 6 in biaxial orientation. The fiber structure 1 is provided with a non-cut region 2 in which continuous fibers of the laminated fiber group 6 combined by yarns 7 in the thickness direction and pulling-out prevention yarns 8 are not cut, and a cut region 3 in which the continuous fibers are cut. The cut region 3 is disposed at the part where deformation is necessary when forming to a product shape. Also, both end parts of the fiber structure 1 are the non-cut region 2. The cut region 3 is apt to deform since the binding force is weak because a part of respective yarns is cut. Accordingly, deformation at the time of forming is easy even when the three-dimensional fiber structure of the continuous fiber is used as a reinforcing material.