Numerical controller capable of properly performing program restart even if machining conditions of a machining cycle are changed

A numerical controller which performs program restart after machining is stopped in the middle of a machining cycle and machining conditions of the machining cycle are changed, the numerical controller comprising:

• a processor configured to:
• acquire a restart position located in a machining area defined by the machining cycle,
• create a new machining area by dividing the defined machining area with respect to the restart position, the defined machining area is divided by a line that is perpendicular to a cutting direction of the machining cycle and intersects the restart position,
• create a block group of commands of the machining cycle corresponding to a new tool path for the new machining area, and based on the changed machining conditions, and
• restart the machining along the new tool path for the new machining area by executing the created block group of the machining cycle.