To provide a polishing method solving conventional problems and having good productivity and excellent surface smoothness in crushing media of zirconium oxide, in particular, having the average grain size of less than 1 mm.

In the polishing method, a polishing target, an abrasive material, an abrasive ancillary material and a solvent are filled inside a polishing barrel, and the polishing target is polished by relatively displacing the polishing target, the abrasive material and the abrasive ancillary material. In this barrel polishing method for spherical bodies, the polishing target is a spherical body and the weight of the abrasive ancillary material is larger than that of the polishing target.