Abstract: To provide a filling material for a bone defect part, which reduces pain and any sense of discomfort and also promotes short-term bone repair. Provided is a filling material for a bone defect part, wherein the filling material is filled in a bone defect part formed between fracture sites in living bone and applies to the fracture site a pressing force in the direction in which the living bone extends from the defect part. Also provided is a filling material for a bone defect part where the filling material is laid in a predetermined length across the bone defect part and continuously applies the pressing force to the fracture site.