To provide a cutter sharpener that permits easy and accurate polishing of hairdressing scissors, a razor, dressmaking scissors and the like even without skill.

A rotary shaft of a motor housed in a housing is projected above the housing, and a disk is fixed at the upper end thereof. The disk is mounted thereon with a doughnutlike polishing disk provided with a through hole at the center and roundly projected at the top middle between the outer circumference and the inner circumference. The through hole of the polishing disk is fitted on the periphery of a circular support ring projected from the center of the disk.