Spindle motor and disk drive apparatus

A spindle motor comprising:

• a base;
• a bearing fixed to the base;
• and
• a rotating portion rotatably supported by the bearing;
• wherein
• the base includes a cup portion including:
• a cylindrical portion coaxial or substantially coaxial with a central axis extending in a vertical direction;
• and
• a bottom plate portion defined integrally with the cylindrical portion, and located to close a lower portion of the cylindrical portion;
• the bearing is inside of the cup portion;
• an outer circumferential surface of the bearing and an inner circumferential surface of the cylindrical portion include a first adhesive layer therebetween;
• the base includes a communicating hole that passes through the bottom plate portion in an axial direction;
• and
• the communicating hole includes a second adhesive layer therein.