PURPOSE: To provide a reinforced foaming body of remarkably improved resistance to breakage and resistance to scattering and its manufacturing method.

CONSTITUTION: At least an inner layer of a reinforced foaming body is provided with a interlaced sheet of fiber/metal mesh, and the fiber is mainly composite fiber 1 composed mainly of a bonding component and a reinforcing component and/or composite yarn, and said interlaced sheet and the foaming body are bonded together integrally through the bonding component of fiber. A interlaced sheet composed of metal mesh with composite fiber and/or composite yarn composed mainly of the bonding component and reinforcing component is disposed in a mold of desired shape, and a material provided with potential foaming properties is filled in said mold space section and heated therein to thermoplastic deform and/or melt the bonding component of fiber simultaneously with foam molding at least to bond integrally a interlaced body with an inner layer section of the foaming body.