Abstract: A spacer is utilized in a recording disk drive, for example. The spacer is made of a mixed material at least including first inorganic powder having the particle size in a range from 10 ?m to 100 ?m, second inorganic powder having the particle size in a range from 0.01 ?m to 1 ?m, and resin material. The resin material is contained in the mixed material at an amount equal to or smaller than 40 volume % to the total amount of the mixed material. The spacer can be formed by molding. The first and second inorganic powder can closely be filled in the resin material. The spacer is thus allowed to enjoy an improved Young's modulus. If the spacer is interposed between recording disks, for example, the spacer serves to sufficiently suppress deformation of the recording disks.