A bone-regeneration material comprising a biodegradable fiber produced using an electrospinning process, wherein the biodegradable fiber comprises 30 to 50 wt % of PLLGA resin and 70 to 50 wt % of -TCP fine particles substantially uniformly dispersed in the PLLGA resin without forming aggregates, wherein the -TCP fine particles are not chemically bonded to the PLLGA resin, and surroundings of the -TCP fine particles are covered by the PLLGA resin so that the -TCP fine particles are not separated from the biodegradable fiber during a formation of the fiber, and wherein the bone-regeneration material is sterilized by using radiation sterilization with gamma ray.