Disclosed is a disc brake capable of constantly maintaining the braking performance by preventing the eccentric abrasion of a pad upon the braking operation. The disc brake includes a disc rotating together with a wheel, inner and outer friction pads installed at both sides of the disc, respectively, a caliper housing supporting the outer friction pad, a wedge member installed at a rear side of the inner friction pad and formed at a rear surface thereof with an inclined surface, a support member fixed to the caliper housing and formed with an inclined surface corresponding to the inclined surface of the wedge member, a driving device operating the wedge member for a braking operation, and a hinge unit for coupling the wedge member to the friction pad. The disc brake further includes an elastic member coupled to the wedge member and the friction pad while interposing the hinge unit therebetween.