A numerical controller capable of reducing labor of an operator's operation in measuring a workpiece controls a machine tool equipped with an imaging device capable of outputting three-dimensional coordinates of a designated position in a captured image and a measuring instrument measuring physical quantity concerning a shape of the installed workpiece. The numerical controller includes a user interface unit displaying the image captured by the imaging device and accepting operation of designating an index point in the image that is an index used when the measuring instrument measures the physical quantity concerning the shape of the workpiece, a program generation unit analyzing the image and coordinates of the index point to narrow down measurement item candidates concerning the workpiece measurement, and generating a program for giving instructions on the measurement operation based on the three-dimensional coordinates of the index point and a measurement item selected from the measurement item candidates, and an execution unit executing the program.