PURPOSE: To obtain the high flux density over the whole necessary parts of a pole surface by a method wherein each pole of a cylindrical magnet is divided into several segments and each segment is individually magnetized.

CONSTITUTION: Each pole is divided into three segments A, B and C to be magnetized separately. Combinations of high permeability materials 2a, 2b and 2c and magnetizing coils 3a, 3b and 3c wound on the respective high permeability material are prepared corresponding to the segments A, B and C. The high permeability material 2a is put facing the segment A which is the edge surface of a cylindrical magnet in order to magnetize the segment A. Then the segment B is magnetized by putting the high permeability material 2b facing the segment B and finally the segment C is magnetized by putting the high permeability material 2c facing the segment C.