Patent ID: 8714319

Claim:
A disk brake comprising: a caliper body extending over an outer periphery of a disk that rotates together with a wheel of a vehicle; a piston projectable from the caliper body in an axial direction of the disk and having an annular contact part at an end thereof at which the piston is projectable; a friction pad that is pressed against the disk by the piston; and a shim plate provided at a rear side of the friction pad to abut the annular contact part; the annular contact part having a diameter smaller than a diametrical length and circumferential length of the shim plate; the shim plate being provided with a plurality of cut portions so that an area of contact between the shim plate and the annular contact part is larger at a disk rotational exit side than at a disk rotational entrance side in a direction of rotation of the disk when the vehicle travels forward; the plurality of the cut portions having at least four contact ends at which peripheries of the cut portions and the annular contact part intersect each other; at least two of the at least four contact ends being provided on a disk rotational entrance side of the shim plate with respect to a diametrical center of the piston.