A tool path evaluation method for evaluating a tool path when machining a work (W) while the rotary tool (T) moves relative to the work (W), and a predetermined target tool path (R1) and Based on the shape of the workpiece (W) before machining by the target tool path (R1), the workpiece is being machined by the target tool path (R1) at the bottom surface portion (TB) at the tip of the rotary tool intersecting the tool rotation axis. The step of calculating the size of the contact area (AT) that is predicted to actually contact (W), and the size of the contact area (AT) at an arbitrary location on the target tool path (R1) are predetermined. A determination step of determining that the target tool path (R1) is inappropriate when the threshold value is exceeded.
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