PURPOSE: To prevent rise of temperature and to carry out efficient polishing by storing a guide liquid in a container storage part, arranging a polishing container filled with a magnetic body abrasive material and a polished article in it free to float and giving a magnetic field reciprocally changing its magnetic pole to this polishing container.

CONSTITUTION: A guide liquid consisting of water and other liquid is stored in a container storage part 1 of a stainless steel made spiral container and others, and in this guide liquid, a polished article 3 such as a dental reparative article, a jewellery, an industrial part and others, a magnetic body abrasive material 4 and, as required, a polishing container 5 filled with acid such as hydrochloric acid are stored free to float. Thereafter, by rotating magnets 8 reciprocally arranging both of an N pole and an S pole in the state of freely rotating under a bottom wall 6 of the container storage part 1 and on the outer periphery of a side wall 7, setting an electromagnet 9 ON and OFF and changing magnetic poles, a magnetic field where the magnetic poles of the N pole and the S pole vary is given to this polishing container 5. Consequently, it is possible to polish the article to be polished 3 by moving the abrasive material 4 in the polishing container 5.