Dust collector

A dust collector, comprising:

• a disk motor having a discoid rotor, a stator, and an output shaft provided coaxially with the discoid rotor;
• a fan rotating under power from the disk motor;
• a tank having space for containing collected dust;
• a head unit covering the tank;
• a filter separating dust from air or liquid sucked into the tank;
• a ventilation opening that opens to an inside of the filter along an axial line of the output is formed on a bottom face of the head unit, wherein:
• the discoid rotor comprises a flange having a flat surface substantially perpendicular to an axial line of the output shaft,
• the fan is integrally provided with the flat surface of the flange, and extends from the flat surface of the flange toward the ventilation opening, and
• the discoid rotor and the fan are integrally provided so as to be adjacent to each other in a direction of the axial line of the output shaft.