This method for generating a tool path for processing a workpiece is provided with: a step for setting a first reference plane (RS1) with respect to the workpiece; a step for setting, with respect to the workpiece, a second reference plant (RS2) which is not parallel to the first reference plane (RS1); a step for interpolating, on the basis of the first reference plane (RS1) and the second reference plane (RS2), a plurality of third reference planes (RS3), which are not parallel to each other, between the first reference plane (RS1) and the second reference plane (RS2); a step in which partial tool paths for processing the workpiece are generated for each of the plurality of third reference planes (RS3) on the basis of the corresponding third reference plane (RS3); and a step for generating a tool path by sequentially connecting the partial tool paths of the plurality of third reference planes (RS3).