There is provided a composition of melt processible fluoropolymer and inorganic fine particles of average particle size 1 .mu.m or less dispersed in said fluoropolymer, said composition being obtained by melt-mixing said melt processible fluoropolymer and aggregated said inorganic fine particles, said aggregated inorganic fine particles being obtained by drying a mixed solution of inorganic fine particles and an inorganic salt to obtain a solid material, removing the inorganic salt from this solid material using a solvent, and then drying at a temperature where surface fusion between the inorganic fine particles does not occur, whereby said aggregates are the result of the mutual cohesive force of the inorganic fine particles, which has good physical properties and dimensional stability compared to the melt processible fluoropolymer alone.