PURPOSE: To easily and efficiently produce a high strength porous SiC sintered body having uniform pore diameter and pore distribution and useful as a microwave-absorbing heating element, a high grade porous lightweight furnace material, etc.

CONSTITUTION: The surfaces of org. spheres are coated with a powdery mixture of 80-90wt.% SiC with 20-10wt.% Al2O3-MgO type spinel and the coated spheres are press-molded and fired. By this method, a molded body contg. uniformly distributed org. spheres can be formed and a high strength porous SiC sintered body having uniform pore distribution as well as uniform pore diameter and also having narrow density distribution is obtd. By combination with the Al2O3- MgO type spinel, the sinterability of the SiC is improved and the strength of the resulting sintered body is further enhanced. When the sintered body is used as a microwave-absorbing heating element, heating to a uniform temp. is attained by satisfactory heating property.