Disclosed is a bone prosthetic material that is capable of preventing a plurality of members from being disconnected due to a difference in the coefficient of thermal expansion, and that is also capable of facilitating the work to insert them while ensuring the bone replacement capability. Provided is a bone prosthetic material comprising: a plurality of prosthetic material pieces and which include bioabsorbable materials having different absorption rates, and which are adjacent and connected to each other and a joint which is provided in a connecting surface between these prosthetic material pieces and, and which is mutually combined to connect the prosthetic material pieces and while limiting displacement in directions along the connecting surface.
