A core plate 1, which has been punched in a core plate punching step 20, is conducted a surface roughing step 30 and a cleaning step 40. After coating both surfaces of the core plate 1 with adhesive in an adhesive coating step 50, the core plate 1 is put on a friction member 2, which has been punched in a friction member punching step 60, in a piling step 70, and a piled body 3 is conveyed to a drying and curing step 80. The core plate 1 is heated by high-frequency heating to dry and cure the adhesive. The core plate 1 and the friction member 2 are heated and pressured by the hot press 91, and the friction plate 4 is completed. Since high-frequency heating is adopted, an apparatus can be downsized, working time can be reduced and production efficiency can be enhanced.