To surely stick a metal plate together with a main body board, and to hold down the cost of equipment investment.

Since the metal plate 13 is induction-heated by the electromagnetic waves of each high-frequency magnetic coil 12, an adhesive layer on one surface of the metal plate 13 is heated by a thermal conduction, the adhesive layer is cured and the laminate of the metal plate 13 and a gypsum board 14 is pressed by each compression roller 11 immediately after the curing, the adhesive layer between both the metal plate 13 and the gypsum board 14 can be cures under the state in which the metal plate 13 and the gypsum board 14 are attached closely.