Cutting Machining Apparatus

A cutting machining apparatus comprising:

• a head including a spindle drive that rotary drives a rotary spindle with a tool secured to a tip of the rotary spindle;
• a first proximity sensor;
• a signal acquirer obtaining detection signal information indicating an intensity of a detection signal that is output from the first proximity sensor when the rotary spindle is rotated in a state in which the head is moved so that the first proximity sensor faces a lateral side of the tool before and after cutting machining of a workpiece using the tool;
• and
• a determiner determining whether or not the tool is broken based on whether or not there is a difference in signal waveforms corresponding to time transitions in intensities of the detection signals indicated by the detection signal information obtained before and after the cutting machining.