PURPOSE: To provide a die for compacting, a magnetic powder, with which the parallel orientation and the radial orientation can be appropriately mixed as the orientation in the easy axis of magnetization of the compact of the magnetic powder, by arranging plural ferromagnetic iron cores respectively on the inside and outside of the circular arc of each of the hollow parts having circular-arcuate cross sections, in which the magnetic powder is formed into compacts through filling the hollow parts with the magnetic powder.

CONSTITUTION: In the die for compacting a magnetic powder, the hard metallic part 82 that is shrinkage-fitted with the metallic ring 80 made of non-magnetic stainless steel is provided with the hollow parts 84a and 84b having circular-arcuate cross sections which are filled with the magnetic powder. The magnetic powder is formed into compacts for the magnets having circular-arcuate cross section by the punching while applying magnetic fields to the magnetic powder from the right and left. The inside magnetic core for the radial orientation 86 and the inside magnetic cores for the parallel orientation 90a to 90d are arranged on the inside of the circular arc of each of the above hollow parts 84a and 84b. On the other hand, the outside magnetic cores for the radial orientation 88a and 88b and the outside magnetic cores for the parallel orientation 92a to 92d are arranged on the outside of the circular arc of each of the hollow parts 84a and 84b. Thus the magnetic field in the central part of the circular-arcuate cross section of each of the hollow parts 84a and 84b is oriented radially and the magnetic fields in both of the end parts of the above cross section are oriented parallel to the symmetry axis of the circular-arcuate cross section.