To suppress a reduction in bonding strength of a friction material caused by rust by reliably preventing rust formation on a friction material bonding surface of backing metal of a disc brake pad.

The edges of recessed and projected portions formed on backing metal 3 are removed to form the chamfering part 10 of a radius of preferably 0.3 or more, and the surface of the backing metal is then provided with a hardened antirust film 6 of a thermosetting resin. Film breaking defect due to surface tension is eliminated on the edge portions. A friction material 2 is bonded to the antirust film 6.