An endoscope system includes an endoscope including an insertion section, an objective lens, a first pipe configured to cause foreign matters to flow through a suction opening provided on a distal end side of the insertion section, a valve configured to switch the first pipe to either one of an open state and a closed state, and a second pipe divided from a part of the first pipe not passing through the valve, a cautery apparatus configured to apply energy to a body tissue, a first suction apparatus configured to suck the foreign matters through the valve in a case where the first pipe is open, and a second suction apparatus configured to suck, through the second pipe, gas containing a solid particle component derived from the body tissue, when energy is applied to the body tissue by the cautery apparatus.
