To provide a radio wave absorber that has extremely excellent absorption efficiency (excellent slant incidence characteristics) even if a radio wave enters the side of a radio wave absorption layer slantwise, and, furthermore, can easily create an optimum electromagnetic absorption surface according to the degree of the arrival of an electromagnetic wave in an execution site.

This radio wave absorber comprises at least two radio wave absorption layers, and a heat transfer conversion layer. In this case, a hologram layer should be provided at the side of each radio wave absorption layer.