It is intended to provide an implant material made of an organic-inorganic composite porous substance which is biologically active and bioabsorbable. Namely, an implant material made of an organic-inorganic composite porous substance which is a biologically active and bioabsorbable porous substance having fine biologically active bioceramic grains uniformly dispersed in a biodegradable and absorbable polymer in vivo and has continuous open pore structure wherein the fine bioceramic grains are partly exposed within the pores and on the surface of the porous substance and a process for producing the implant material made of an organic-inorganic composite porous substance characterized by comprising dissolving a biodegradable and absorbable polymer in a volatile solvent, dispersing fine biologically active bioceramic grains therein, forming a non-woven fabric like fibrous aggregate from the liquid mixture thus prepared, molding it by heating under elevated pressure to give a porous fibrous aggregate, immersing the synthetic fibrous aggregate in a volatile solvent and then eliminating the solvent.
