To provide a caliper supporting mechanism, which can effectively restrict the distortion of a caliper with the operation of a mechanical disk brake for parking and which can reduce the dragging of a brake pad, abrasion of a guide pin and abrasion of an operating shaft to a degree as small as possible.

In this mechanical disk brake for parking, a bracket 22 is fixed to a support 20 of a caliper, and the outer end of an operating shaft 4 is supported by this bracket 22 freely to be rotated, and the axial movement of the operating shaft 4 is restricted by the bracket 22.