An endoscope system (1) provided with the following: an endoscope (2) having an insertion section (21), an imaging section (25) for acquiring a plurality of images by capturing in time-series optical images of a subject using an objective optical system (24) provided to a distal end of the insertion section (21), and a channel (26) that opens at the distal end of the insertion section (21); a laser probe (5) that is inserted into the channel (26); an image analysis unit (33) for detecting, for each of the images, an image portion of the laser probe (5); and a control unit (35) for allowing laser output only if the laser probe (5) has been determined to have protruded from the opening of the channel (26) on the basis of the results of detection of the image portion of the laser probe (5) with respect to a plurality of images that are continuous in time series.