PURPOSE: To provide a copy milling method capable of processing many works of the same shape simultaneously by placing a plurality of works at equal distances from the center of rotation of a plurality of rotary tables.

CONSTITUTION: Model 1 is placed corresponding to stylus 2. On the other hand, four pieces of works 3 are placed on each of three rotary tables 5 at equal distances from each center of rotation and at equal intervals. Under this condition, stylus 2 is caused to follow the shape of model 1. By means of end-mill cutter 4, work 3 is milled into the same shape as model 1. When milling on work 3 is completed, each rotary table is turned 90 degrees, and the next works 3 are placed at the positions of cutters 4, and the same operation is repeated.