PROBLEM TO BE SOLVED: To provide a dental adhesive composition which is used as any of a dental adhesive exhibiting strong and stable adhesiveness, dental adhesive composite resin and dental adhesive cement, and is also used as a dental pretreatment material.SOLUTION: A dental adhesive composition is composed of polyorganosiloxane containing a polymerizable group which has a silsesquioxane structure in a part and a polymerizable monomer containing an acidic group such as a phosphate group and a carboxy group. The dental adhesive composition can comprise a hydrophilic polymerizable monomer and a polymerization initiator.COPYRIGHT: (C)2015,JPO&INPIT【課題】強固で安定的な接着性を示す歯科用接着材、歯科用接着性コンポジットレジン及び歯科用接着性セメントのいずれかとして用いられ、または歯科用前処理材としても用いることができる歯科用接着性組成物の提供。【解決手段】シルセスキオキサン構造を一部に有する重合性基含有ポリオルガノシロキサンとリン酸基又はカルボキシ基等の酸性基含有重合性単量体とからなり、さらに親水性重合性単量体と重合開始剤とを含むこともできる歯科用接着性組成物。【選択図】なし