To develop a radio wave absorbent which is excellent in radio wave absorbing properties, superior enough in shock resistance so as not to be chipped or damaged when it is manufactured or in use, and high in productivity.

This radio wave absorbent (1) is composed of two or more molded bodies (2) which are each formed into a pyramid shape or a wedge shape whose tip has a radius of 0.5 to 7.5 mm and a base (3), the radius of a trough between the adjacent molded bodies is 7.5 mm or below. The radio wave absorbent unit (1) composed of the molded bodies (2) and the base (3) is formed of polypropylene conductive expandable beads by integral molding, and the adjacent units 1 are joined together by fitting projections provided to one of the units 1 to recesses cut in the other of the units 1. The expandable beads are 2 to 10 mm in diameter and have two or more different types of diameters. The molded bodies (2) may each have a hollow structure (6).