To change a caliper peculiar number of vibration and reduce a brake noise by changing its mass distribution arbitrarily, while making a caliper shape in a right/left symmetrical shape.

In a seramics form in response to caliper body half parts 18R, 18L, a body half part form is made by mixing, dispersing and molding a binder to a seramics material like alumina and silicon carbide. At this time, the volume content rate of the seramics form 18R of one side of the body half part is set as, for example, 30% and that of the other 18L is set as 40%. A die is formed by covering the outer periphery of a caliper form made by jointing the molded form with a different volume content rate mutually by the metal covering material and a metal matrix is formed like above by filling aluminum metal or its alloy to the inside and impregnating to the gap in a reinforcement material form. A laterally divided method divided by a parallel plane to a roter surface can be adopted except this divided form. Thereby, a brake noise can be restrained effectively.