To provide a working machine capable of working highly accurately a shaft or cylindrical parts having bearing holes like a fixed unit or rotary unit of a motor with few run-out.

Cylindrical parts 24 are inserted rotatably into a fixing chuck 41 or the like to be rotated by pressing a driving means 43 against the cylindrical parts. A portion of the cylindrical member 24 is worked by allowing a cutter rotated with high speed to abut against the cylindrical parts with rotary spindles 45A, 45B. Thus, the cylindrical parts to be worked can be rotated with high speed without run-out due to the inclusion of foreign matter during the working so that the cylindrical parts can be worked with high accuracy.