PURPOSE: To prevent an anchor from being removed and released from the wall surface by fixing an anchor made of a metal wire to the rear of a main body of a radio wave absorber so as to heighten junction force with sticking mortar.

CONSTITUTION: An anchor 3 made of a metal wire is provided on the back of a radio wave absorbing material of the main body 2 of a radio wave absorber, that is to say such as Ni-Zn ferrite. Recessed stripes 4 are formed on the rear of the main body 2. A base part 3a is stuck to the main body 2 inside the stripes 4 with an adhesive. A beam part 3c is extended in the parallel direction with the base part 3a and a beam part 3d is extended in the orthogonal direction to the base part 3a. Thereby, junction force with sticking mortar is heightened so as to prevent the anchor 3 from being removed from the wall surface.