To obtain a filled resin molding containing a filler, having improved surface properties and prevented in deterioration in toughness by making a filler in a molding distributed in such a manner that the concentration of the filler, which has a specific gravity higher than that of the resin, is higher in the surface region that in the inner region.

A composition containing a monomer or an oligomer, 1-50 wt.%, particularly, 5-30 wt.% filler having a specific gravity higher than that of the resin to be formed, and optionally, a catalyst and a polymerization initiator is poured into a rotating mold and polymerized to a viscosity of 1-1,000 Pa.s, particularly, 10-100 Pa.s while it is centrifugally pushed against the inner wall of the mold to form a surface region having a thickness of 1-50 mm. Next, a composition containing a filler in such an amount that the ratio of the filler content of the surface region to that of the inner region is 10/9 to 10/0, a monomer or an oligomer, and, optionally, a catalyst and a polymerization initiator is poured into a mold and polymerized to obtain a molding in which the concentration of the filler having a specific gravity higher than that of the resin is higher in the surface region than in the inner region.