A two-package dental adhesive composition having excellent adhesiveness to various dental materials and excellent storage stability, characterized by comprising a first agent and a second agent packaged separately from each other and by containing at least the following five components: (A) a polymerizable monomer containing an acidic group； (B) a polymerizable monomer containing a sulfur atom； (C) a silane coupling agent； (D) a borate compound； and (E) water, wherein the first agent contains, from among the five components, only (A) the polymerizable monomer containing an acidic group and (B) the polymerizable monomer containing a sulfur atom, and the second agent contains, from among the five components, only (C) the silane coupling agent, (D) the borate compound, and (E) the water.
