A tool path generation method for generating a second tool path by performing a smoothing process on a first tool path for processing a work (91) with a machine tool (1) includes a change rate calculation step of calculating a curvature change rate of the first tool path at a plurality of moving points (P n ) of the first tool path. The tool path generation method includes: a weight calculation step of calculating a moving average weight on the basis of the curvature change rate of the first tool path at each of the moving points (P n ); and a step of calculating coordinate values of the moving average of the moving points (P n ) using the weight at each of the moving points (P n ), and setting the coordinate values of the moving average of the moving points (P n ) as moving points of the second tool path.