PROBLEM TO BE SOLVED: To provide a dental adhesive composition exhibiting strong and stable adhesiveness to any of enamel and dentine.SOLUTION: The dental adhesive composition comprises a mixture obtained by mixing: (A) a dihydrogen phosphate monoester group-containing polymerizable monomer represented by general formula (1); (B) a hydrogen phosphate diester group-containing polymerizable monomer, (C) a polyvalent metal compound selected from at least any of polyvalent metal alkoxides, polyvalent metal fluorides, polyvalent metal carbonates, polyvalent metal hydrides, and alkyl polyvalent metals. In the formula, Rrepresents a hydrogen atom or methyl group, and X represents a hydrocarbon group having 4 or more carbon atoms.SELECTED DRAWING: None【課題】エナメル質及び象牙質のいずれに対しても強固で安定的な接着性を示す歯科用接着性組成物の提供。【解決手段】(A)一般式(1)で表されるリン酸二水素モノエステル基含有重合性単量体と、(B)リン酸水素ジエステル基含有重合性単量体と、(C)多価金属アルコキシド、多価金属フッ化物、多価金属炭酸塩、多価金属水素化物及びアルキル多価金属の少なくともいずれかから選ばれる多価金属化合物と、を混合して得られる混合物を含む歯科用接着性組成物。式中、R1は水素原子又はメチル基を示し、Xは炭素数4以上の炭化水素基を示す。【選択図】なし