Processing system and method for manufacturing processed object

A machining system for sequentially machining a plurality of workpieces, the machining system comprising: a tool for machining the workpieces; a motor that rotates the cutter or the workpiece; a control unit that controls the motor; the control unit includes a first control unit that controls a rotational speed of the motor on the basis of a first difference between a first electric quantity acquired by the measuring unit at a specific machining site of a first workpiece being currently machined, and a second electric quantity acquired by the measuring unit at a specific machining site of the first workpiece being currently machined, and a second control unit that controls the rotational speed of the motor on the basis of a second difference between the first electric quantity and the second electric quantity. The second electric quantity is an electric quantity acquired by the measuring unit during machining of a portion of a second workpiece corresponding to the specific machining portion, and the second wo