A numerical control device includes an NC command decoding unit and a tool information storage/generation unit. The NC command decoding unit has a cut amount decoding unit for decoding the cut amount for rough machining, a machining shape generation unit for generating a finishing shape, a machining pathway generation unit for generating a path for rough machining, a tool direction provisional determining unit for provisionally determining the direction of the tool, a path joining assessment unit for assessing whether or not to omit a round-up operation, a machining path joining unit for generating a new path for directly moving to the end point of the next operation after the round-up operation if the round-up operation is to be omitted, and a tool direction determining unit for determining the direction of the tool at each machining shape change point on a path for rough machining including the new path.