A machining path creation device includes an analysis unit configured to create a machining path by analyzing a machining program, a shape determination unit configured to determine ON/OFF of a smoothing processing function at each part of the machining path, based on the shape of each part of the machining path created by the analysis unit, and a smoothing processing unit configured to perform smoothing processing on a part of the machining path in which the smoothing processing function is determined to be ON, and not to perform smoothing processing on a part of the machining path in which the smoothing processing function is determined to be OFF, based on a determination result obtained by the shape determination unit.