Abstract: There is provided a spindle motor including: a base member having a through-hole formed therein; a circuit board installed on a lower surface of the base member and including a communication hole formed therein to correspond to the through-hole; an insulating member insertedly disposed in the through-hole and having a lead part of a coil penetrating therethrough; and a sealing member filling a space formed by the insulating member insertedly disposed in the through-hole and the base member to thereby close the through-hole.