Abstract: The objective of the present disclosure is to provide a means capable of performing clamping and unclamping operations at appropriate times. In a machining system 1 provided with a rotary table device 10, a numerical controller 30 according to an embodiment of the present disclosure controls the rotary table device 10 in accordance with a machining program including a plurality of statements, said rotary table device 10 including a table 11, drive mechanisms 12, 13 that rotate and position the table 11 around an axis, and clamping mechanisms 14, 15 that restrain the rotation of the table 11.