To provide a curable composition having good cavity repair workability, the appearance of a hardened body formed in harmony with natural teeth, and the harmony with natural teeth. A curable composition comprising a polymerizable monomer component (A), a spherical filler (B) having an average particle diameter in the range of 230 nm to 1000 nm, and a polymerization initiator (C), and having a thickness of 1 mm In the state where each color was measured, the lightness (V) of the colorimetric value measured by the Munsell color system of colored light under a black background, measured using a color difference meter, was less than 5, and the saturation (C) was 0. Curability, characterized in that the brightness (V) of the colorimetric value by the Munsell color system of colored light under a white background is 05 or more and the chroma (C) is less than 2 Composition.窩洞の修復作業性が良好であると共に、形成される硬化体の外観が天然歯牙と調和し、且つ天然歯牙との調和が継続する硬化性組成物を提供すること。 重合性単量体成分（Ａ），平均粒子径が２３０ｎｍ～１０００ｎｍの範囲内にある球状フィラー（Ｂ）及び重合開始剤（Ｃ）を含む硬化性組成物であって、厚さ１ｍｍの硬化体を形成した状態で、各々色差計を用いて測定した、黒背景下での着色光のマンセル表色系による測色値の明度（Ｖ）が５未満であり、彩度（Ｃ）が０．０５以上であり、且つ白背景下での着色光のマンセル表色系による測色値の明度（Ｖ）が６以上であり、彩度（Ｃ）が２未満であることを特徴とする硬化性組成物。
