PURPOSE: To improve the practical utility by laminating a specific resistance film on the upper surface of a dielectric layer of predetermined thickness.

CONSTITUTION: A dielectric layer 2 having λ/4 of thickness, where λ is radio wave length in a dielectric layer, is provided on a conductive plate 1. A resistance film 3 in which semiconductive ceramic carbon fiber having 0.1∼100 μm of diameter, 10∼100 of aspect ratio and 10-3∼102Ω.cm of volume resistivity is dispersed to be mixed in polymer substance, and a protective film 4 are laminated on the layer 2 to form a radio wave absorber. This absorber is preferably matched in space impedance to provide a light weight, a thin type, high durability, weather resistance and waterproofness against the radio wave of wide frequency band, and good workability by a coating method, thereby improving its practical utility.