PROBLEM TO BE SOLVED: To provide a cement composition useful for bone or tooth repair. SOLUTION: The following components (A), (B) and (C)； (A) Portland cement (B) Fluoride ion supplying compound having a particle diameter D90 of 3.5 μm or less, and (C) phosphate ion supplying. The compound has a Ca content of 37 to 51% by mass, a Si content of 6 to 14% by mass, an Al content of 0.1 to 3.2% by mass, and an F content of 0.1 to 1.4% by mass. , A cement composition for bone or tooth restoration, which is obtained by mixing P at a ratio of 0.9 to 3.0% by mass. [Selection diagram] None【課題】骨又は歯の修復に有用なセメント組成物を提供すること。【解決手段】次の成分（Ａ）、（Ｂ）及び（Ｃ）；（Ａ）ポルトランドセメント（Ｂ）粒子径Ｄ90が３．５μｍ以下であるフッ素イオン供給化合物、及び（Ｃ）リン酸イオン供給化合物を、Ｃａ含有量が３７～５１質量％、Ｓｉ含有量が６～１４質量％、Ａｌ含有量が０．１～３．２質量％、Ｆ含有量が０．１～１．４質量％、Ｐ含有量が０．９～３．０質量％となる割合で混合してなる、骨又は歯の修復用セメント組成物。【選択図】なし
