THERMAL DISPLACEMENT COMPENSATION DEVICE AND NUMERICAL CONTROLLER

To provide a numerical controller capable of setting an index for an axis combination in a path and selecting a proper compensation model using the index. A numerical controller comprises: a thermal displacement compensation setting unit that sets an index of an axis combination as a target of implementation of thermal displacement compensation from control axis information data in which a control axis is recognizable, and finds a compensation model index matching the index, thereby selecting a corresponding compensation model; and a thermal displacement compensation unit that calculates a compensation value from operating state data having correlation with thermal displacement and from the compensation model.