An endoscope system is constituted by a processor and an endoscope. The processor includes: a ground terminal that is provided on an outer cover surface of a housing； a feedback terminal that is provided on the outer cover surface, and is connected to the ground terminal via an external capacitor arranged outside the housing； and a relay wiring line that is connected to the feedback terminal, and is arranged in the housing. The endoscope includes: a connector portion that is detachably attached to the processor； a channel into which a treatment tool is inserted； and a feedback wiring line that connects a metal member located in the vicinity of the channel to the connector portion. In this configuration, when the connector portion is attached to the processor, the feedback wiring line and the relay wiring line are connected to each other.
