A bone prosthesis material that promotes calcium ion elution while retaining its effect on osteoclasts so that its binding to a bone can be achieved at an early stage. The bone prosthesis material that is composed of a plurality of β-tricalcium phosphate (β-TCP) phases containing monovalent cations in solid solution at different concentrations. Being a composite phase of β-TCP phases containing monovalent cations in solid solution at different concentrations, the bone prosthesis material promotes calcium ion elution while retaining its effect on osteoclasts, and thus enables its binding to a bone at an early stage.
