The invention provides a means which can securely prevent an idle running and a scattering of a
magnet while restricting a manufacturing cost as low as possible, in a rotor used in a brushless motor. A rotor (101) is provided with a sintered ring
magnet (12) in which not-ground recess portions (12a) are formed in an axial direction of a inner
peripheral surface in correspondence to a magnetic pole, and a portion between the recess portions (12a) is ground in an inner
peripheral surface (12b) having a desired inner
diameter, a rotor yoke (11) in which convex portion (11b) having a larger
diameter than the inner
diameter (r4) of the sintered ring
magnet (12) are formed in an axial direction of an outer
peripheral surface in correspondence to the recess portion (12a), and a through hole (11a) is pierced in an axial center, and which is concentrically adhered to the sintered ring magnet (12) by fitting the recess portion (12a) and the convex portion (11b), and a shaft (10) inserted and fitted to the through hole (11a) of the rotor yoke (11).