The present invention exhibits high initial adhesive strength, adhesive durability, and dentin cohesive destruction rate with respect to dentin (wet body), and is a non-solvent type dental adhesive that substantially does not contain water and organic solvents. A sex composition is provided. The present invention has an acidic group-containing polymerizable monomer (A), a hydrophobic polymerizable monomer having no acidic group (B), and a water-soluble substance having a solubility in water at 25 ° C. of 10 g / L or more. The present invention relates to a non-solvent-based dental adhesive composition containing a photopolymerization initiator (C).本発明は、歯質（湿潤体）に対して高い初期接着力、接着耐久性、象牙質凝集破壊率を示し、且つ、水及び有機溶媒を実質的に含有していない非溶媒系歯科用接着性組成物を提供する。本発明は、酸性基含有重合性単量体（Ａ）、酸性基を有しない疎水性重合性単量体（Ｂ）、及び２５℃での水への溶解度が１０ｇ／Ｌ以上である水溶性光重合開始剤（Ｃ）を含有する、非溶媒系歯科用接着性組成物に関する。
