PROBLEM TO BE SOLVED: To provide an organic-inorganic composite filler that exhibits excellent mechanical strength due to high mechanical strength and stable paste properties thereof and can be blended in dental curable compositions, such as crown materials, filling materials, prosthetic materials, and adhesive materials, which are used in the field of dentistry.SOLUTION: The present invention provides an organic-inorganic composite filler, which is produced by blending (a) a polymerizable monomer containing at least one functional group selected from a -OH group, a -NH group, and -NHgroup; (b) a polymerizable monomer free of the functional group described above; (c) a polymerization initiator; (d) an inorganic filler; and (e) a silane compound that generates an -OH group by hydrolysis.SELECTED DRAWING: None【課題】歯科用分野で用いられる歯冠材料、充填材料、補綴材料及び接着材料等の歯科用硬化性組成物に配合する、高い機械的強度と安定したペースト性状による優れた操作性を発現する有機無機複合フィラーの提供。【解決手段】-OH基、-NH-基、-NH2基の中から少なくとも一つの官能基を含有する重合性単量体(a)、前記記載の官能基を含有しない重合性単量体(b)、重合開始材(c)、無機フィラー(d)、及び加水分解により-OH基を生成するシラン化合物(e)を含有して製造される有機無機複合フィラー。【選択図】なし