A brake pad is incorporated into a caliper so as to be movable in the axial direction of a rotor and rotatable around a rotation axis; a piston which presses the brake pad toward a disk rotor; and biasing members which bias the brake pad in order to hold the brake pad, wherein: the brake pad has contact sections, which are sections contacting the biasing members; the contacting sections have contact planes coinciding with virtual planes including the rotation axis of the brake pad; and the biasing members bias the contact planes in a direction perpendicular to the contact planes.