To provide a one-package urethane adhesive composition for norbornene resins, having excellent adhesiveness to a molded article of a norbornene resin and bondable immediately after the molding of the molded article.

The one-package urethane adhesive composition for norbornene resins contains (A) a urethane prepolymer produced by reacting diphenylmethane diisocyanate with a polyol compound and (B) a urethane prepolymer produced by reacting a polyol compound with a compound containing an isocyanate group and having low reactivity with active hydrogen compared with diphenylmethane diisocyanate.