To shorten the process for producing a radio wave absorption wall or enhance adhesion strength of an exterior material by arranging a spacer between the exterior material and a reflective iron bar, positioning a continuous body of a plurality of ferrite magnetic bodies at the spacer and integrating them with concrete.

The radio wave absorption wall is arranged with a spacer 2 on the rear surface of an exterior material 1. A header tile is generally employed as the exterior material 1 and the spacer 2 is made of vinyl chloride. A plurality of ferrite magnetic bodies 3 are secured temporarily while being arranged continuously. Planar ferrite magnetic bodies having central through hole are coupled through coupling members 6 to produce a continuous body which is interposed between the spacers 2. The continuous bodies are arranged continuously in the direction of magnetic field of an incoming radio wave at an interval in the direction of electric field component (horizontal direction). A reflective iron bar 4 is arranged at the other end of the spacer 2 before concrete is placed.