This is to provide an organic and inorganic composite filler to yield excellent surface smoothness similar to that of a natural tooth and to cause low polymerization shrinkage when used for a dental restoration material composite, and to acquire a dental restoration material composite having high X-ray imaging property and high mechanical strength. The organic and inorganic composite filler used for a dental restoration material is produced by curing and pulverizing a (meth)acrylate compound including 50 to 80% by weight of a glass powder having a maximum particle diameter of 5µm or less, an average particle diameter from 0.05 to 2µm, and X-ray imaging property, and 10 to 40% by weight of a metal compound having an average particle diameter from 0.005 to 0.3µm and X-ray imaging property, where the (meth)acrylate compound includes 90% by weight of both the glass powder and the metal compound at the maximum. The organic and inorganic composite filler has preferably an average particle diameter from 10 to 30µm.