An endoscope system having: an endoscope having: a first transmission electrode arranged to a channel defined by the endoscope and a second transmission electrode arranged to the channel, wherein the first transmission electrode and the second transmission electrode are electrically connected to the power source and a treatment tool having: a first reception electrode arranged to a treatment tool insertion section, and spaced apart from the first transmission electrode to form a first capacitor a second reception electrode arranged to the treatment tool insertion section, and spaced apart from the second transmission electrode to form a second capacitor and an electrically powered treatment device configured to be moved by the treatment tool insertion section, wherein the electrically powered treatment device is electrically connected to the first reception electrode and the second reception electrode to be powered to perform a treatment on a subject.
