To realize integral bending of a flat-plate-shaped laminated material without causing a gap between a face plate and a core material or one-side hitting and to dispense with an additional member or the like in ensuring a strength in a bending part of the laminated material.

The laminated material being a material provided with a non- adhering part 12 is set on a fixed table 30 and a bending table 40 of a bending apparatus and fixed by vacuum suction pads 31 and 41. An upper bending table 50 is put on the face plate 12 of the non-adhering part 12a. The face plate 12 is sucked by a vacuum suction pad 51 of the bending table 50. The face plate 12 is bent by rotating the bending table 50. The core material 13 is cut in the shape of a letter V. An adhesive is applied. Then, the face plate 11 is bent by rotating the bending table 40 and the core material 13 is adhered to the face plate.