To provide an extrudable crosslinked grease-like electromagnetic wave absorber that is excellent in electromagnetic wave absorbability, thermal conductivity, and flame retardant, is reduced in temperature dependency, and can be applied to gaps to which sheet products are hardly applicable and thin coating.

The crosslinked grease-like electromagnetic wave absorber is prepared by dispersing an electromagnetic wave absorbing filler, preferably, composite filler of an electromagnetic wave absorbing agent and a flame retarder in a crosslinking silicone gel, preferably, a crosslinking silicone gel having the denseness of 50-200 (JIS K2220: 1/4 cone). The extrusile crosslinked grease-like electromagnetic wave absorber has a self-shape retaining property while the absorber has fluidity and contains the electromagnetic wave absorbing agent at a rate of 200-800 pts. wt. to 100 pts. wt. crosslinking silicone gel.