An endoscope system includes an endoscope including an insertion section and an objective lens provided in a distal end portion of the insertion section, a first pipe configured to cause foreign matters that are a cause of obstruction of an observation field of view of the objective lens to flow through, a valve configured to switch the first pipe to either one of an open state and a closed state, a first suction apparatus configured to suck the foreign matters through the valve in a case where the first pipe is in the open state, a second pipe divided from a part of the first pipe not passing through the valve, a cautery apparatus configured to apply energy and perform a surgical treatment on a body tissue in the observation field of view of the objective lens, and a second suction apparatus configured to suck fluid through the second pipe when energy is applied to the body tissue by the cautery apparatus.
