Fan

A fan comprising:

• a stationary portion including a stator;
• a bearing mechanism;
• and
• a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion;
• wherein
• the rotating portion includes:
• a shaft;
• a rotor portion fixed to the shaft;
• and
• an impeller including a plurality of blades and an annular impeller cup arranged to support the blades;
• the rotor portion is in a shape of a covered cylinder, and includes a cover portion and a cylindrical portion;
• the impeller is fixed to an outer circumferential surface of the cylindrical portion of the rotor portion;
• the outer circumferential surface of the cylindrical portion and an inner circumferential surface of the impeller cup have a joining portion therebetween;
• at least one of the outer circumferential surface of the cylindrical portion and the inner circumferential surface of the impeller cup includes a groove portion recessed radially from the joining portion;
• the groove portion includes an upward facing surface;
• an adhesive is arranged in the groove portion;
• and
• at least a portion of the adhesive is arranged above the upward facing surface of the groove portion.