(Task) To provide a laser processing device capable of monitoring the output of a laser beam being processed while processing a workpiece, without interrupting the processing. (Solution means) The laser beam irradiation unit of the laser processing apparatus includes a laser oscillator, a mirror that reflects the laser beam emitted from the laser oscillator and propagates to the processing point, and outputs the leakage light of the laser beam transmitted without being reflected by the mirror. And a condensing lens for condensing the laser beam propagated by the mirror and irradiating the object to be processed. The control unit measures the output of the leakage light of the laser beam with the output measuring unit while irradiating the laser beam to the workpiece.
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