An automatic monitoring interval-setting device, a machine tool, and an automatic monitoring interval-setting method by which a monitoring interval monitoring a load applied to a tool is able to be automatically set are provided. An automatic monitoring interval-setting device includes a control device including a memory section which stores a program including G1 to G3 for processing a workpiece by using a tool, and a calculating section which is able to edit the program and executes a monitoring interval setting step of respectively inserting starting monitoring of a load applied to the tool into the front of G1 to G3 and ending the monitoring of the load into the rear of G1 to G3 with respect to the program.
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