An endoscope system includes a nozzle provided at a tip of a tube forming member, communicating with a fluid tube, and injecting a fluid supplied from the fluid tube toward a window part of an endoscope insertion part, a first gas supply tube provided between a gas supply source and the fluid tube and guiding a gas to the fluid tube, a second gas supply tube having a limiting device limiting a pressure or a flow rate of the gas supplied from the gas supply source, the second gas supply tube guiding the gas with the pressure or the flow rate limited by the limiting device to the fluid tube, and a gas switching device provided only to the first gas supply tube between the first and second gas supply tubes and selectively switching between supplying and stopping of the gas to the fluid tube.
