Numerical controller having a machining time prediction function

A numerical controller performing machining of a workpiece by controlling a machine including at least one axis based on a machining program, the numerical controller comprising:

• a reference machining time prediction unit for, prior to a first actual machining by the machine, predicting a reference machining time corresponding to a machining time not considering acceleration/deceleration of the axis based on the machining program;
• an acceleration/deceleration frequency prediction unit for, prior to the first actual machining by the machine, predicting the number of times of acceleration/deceleration of the axis in the machining based on the machining program;
• a data storage unit for storing information related to a deviation time corresponding to a difference between a first actual machining time corresponding to a machining time required for the first actual machining by the machine and the reference machining time;
• a correction time calculation unit for calculating, after the first actual machining, a correction time for correcting the reference machining time based on the number of times of acceleration/deceleration predicted by the acceleration/deceleration frequency prediction unit and the information related to the deviation time stored in the data storage unit;
• and
• a machining time prediction unit for calculating a predicted machining time for a second actual machining subsequent to the first actual machining, by correcting the reference machining time using the correction time.