To eliminate the need of a stator unit from being fixed on the top face side of a base member expanded in the direction perpendicular to a center shaft extended up and down, in a spindle motor.

An annular core back 321a centering around the center shaft for a rotary part 4 rotated to the base member 31 and the stator unit 32 and a stator core 321 including a plurality of teeth 321b projected towards the radial inside from the core back are mounted on the spindle motor. A weir limiting an intrusion to the radial inside of an adhesive is mounted further on the spindle motor for separating a first region 51 interposing the adhesive 34 between the center shaft and the stator unit 32 and a second region 52 interposing no adhesive 34 between the center shaft and the stator unit on the top face side of the base member 31 in response to coils 322a and 322b wound on a plurality of the teeth.