Spindle motor with bearing part arrangement and disk driving device having same

A spindle motor comprising:

• a shaft that extends along a center axis extending in a vertical direction;
• a base part that has a through hole to which a lower end portion of the shaft is fixed;
• a stator core in an annular shape that is disposed on an upper surface of the base part and surrounds the shaft;
• a rotor that rotates around the center axis;
• and
• a bearing part that rotatably supports the rotor with the shaft as a center axis,
• wherein the shaft has a screw hole extending axially downward from an upper end of the shaft,
• wherein the screw hole has a screw part onto which a screw is screwed,
• wherein the bearing part includes:
• an upper annular member and a lower annular member which protrude radially outward from an outer peripheral surface of the shaft and are disposed to be spaced apart from each other in an axial direction;
• and
• a sleeve in a cylindrical shape that has an insertion hole into which the shaft is inserted, covers the outer peripheral surface of the shaft, and extends in the axial direction, and
• wherein an upper end of the upper annular member is disposed lower than a lower end of the screw part in the axial direction.