To solve such problems that a resorcinol resin-based adhesive has excellent properties, and is widely used for a laminated lumbers and the like, while involving the problems that it is unfavorable for the health of an operator because the operator sucks paraformaldehyde powder used as a curing agent for the resorcinol resin-based adhesive due to scattering in the air on operation, and also in many cases, forming a lump when blending the powder with the base resin, thus limiting further improvement of the efficiency of the bonding operation.

The conventional problems are solved by using an adhesive comprising a principal agent composed of the resorcinol-based resin and a curing agent blended with a component containing at least an oxazolidine compound, and the efficiency of the bonding operation is improved by using a method by feeding the resin and the curing agent separately, mixing them in a mixer and then applying the mixture by using a discharging type coater.