To provide a method for bonding a reinforcing material to an external plate of a car body at a low cost in excellent workability without causing sink mark, strain, etc., and to obtain an adhesive container.

First, pressure is applied to a main body tube 4 of an adhesive container to squeeze out an adhesive 10A having hardness soft in curing from the upper side of a nozzle part 4a and to press out an adhesive 12A having hardness hard in curing from the lower side of the nozzle part 4a. Consequently, the top of a reinforcing material 20 is coated with the adhesive 12A, which is coated with the adhesive 10A. Then the reinforcing material 20 is spot welded to a pillar 24 and covered with a side panel (external plate) 22. Consequently, the adhesive 10A having hardness soft when cured is stuck fast to the side panel 22. Afterward, the body is coated by electrodeposition, heated and dried. The adhesives 10A and 12A are cured by the operation to form cured adhesive layers 10B and 12B.