To provide an adhesive which is a phenol resin and polyvinyl acetal resin adhesive, a solution adhesive with low toxicity and environmental friendliness and a phenol resin and polyvinyl acetal resin adhesive with low toxicity and environmental friendliness, and has hot adhesion strength and ordinary state adhesion strength after heat aging.

The phenol resin and polyvinyl acetal resin adhesive includes: (A) 100 pts.wt. of a polyvinyl acetal resin; (B) 30 to 300 pts.wt. of a phenol resin; (C) 100 to 500 pts.wt. of a carbonic ester; and (D) 10 to 200 pts.wt. of a methanol.