To provide a spindle motor highly stabilized in rotational speed.

A stator centering member 27 is provided which is fittingly fixed to a motor shaft 2 for a motor shaft fixed spindle motor, and fittingly fixed to at least one outer ring 9 of rolling bearings 3, 4 or the common outer ring of both bearings for a motor shaft rotating spindle motor so as to be coated by injection molding to at least the inner periphery of a laminated core 24 provided on a stator 26 to retain the laminated core 24, and so that the surfaces 39, 40 facing the laminated core 24 and a permanent magnet provided on a rotor 14 may be disposed with high accuracy, concentricity, and cylindricality. An air gap 43 between the facing surfaces 39, 40 facing the laminated core 24 and the permanent magnet 23 is made even circumferentially and axially to make the rotations of the rotor 14 and a hard disc accurate.