To provide a device, by which a ferrite plate can be buried and fixed simply into a concrete wall-surface panel and an exterior tile can be attached firmly.

In the concrete wall-surface panel, the ferrite plates 4 absorbing radio waves reflected by wave reflection layers 12 are buried continuously into the concrete wall-surface panel 1 with the wave reflection layers 12 in a row, and exterior tiles 3 are installed onto the surface of the panel 1. A fixing frame having continuous recessed grooves, in which a plurality of the ferrite plates 4 are housed in a row, and being made of a nonmetal such as vinyl polychloride is mounted into the concrete wall-surface panel 1 at that time, and axial anchor members 11 projected while being inserted into the bottom sections of the recessed grooves and the ferrite plates are set up.