Provided is a curable composition which comprises a polymerizable monomer (A), spherical particles (B) having an average primary-particle diameter in the range of 230-1,000 nm, and a polymerization initiator (C), wherein at least 90% of the individual particles constituting the spherical particles (B) lie in the range of ±5% based on the average primary-particle diameter and the polymerizable monomer (A) and the spherical particles (B) satisfy requirement (X1) shown by the relationship nP<；nF (1) (nP indicates the 25°C refractive index of a polymer obtained by polymerizing the polymerizable monomer (A), and nF indicates the 25°C refractive index of the spherical particles (B).). When a 1 mm-thick cured object is formed from the curable composition and examined with a color-difference meter using colored light, then the color of the cured object measured on a black background has a Y value (Yb) according to the Munsell color system and the color of the cured object measured on a white background has a Y value (Yw) according to the Munsell color system, the ratio therebetween, Yb/Yw, being within the range of 0.2-0.5.
