To provide a cured product having high fracture energy, provided are a curable composition, including: (A) organic-inorganic composite particles； (B) a polymerizable monomer； (C) a polymerization initiator； and (D) inorganic particles, in which a cured body formed by curing the curable composition includes: a matrix formed by curing all constituent components of the curable composition except for (A) the organic-inorganic composite particles； and (A) the organic-inorganic composite particles dispersed and contained in the cured body, and in which an elastic modulus M of the matrix is larger than an elastic modulus P of (A) the organic-inorganic composite particles by 3.0 GPa or more, a dental restoration material using the curable composition, and an organic-inorganic composite particle for dental use to be used for the dental restoration material.
