An endoscope system includes an image pickup section provided with an image sensor and configured to obtain an examination image a cable that transmits the examination image and a processor that receives the examination image, performs image processing, and displays the processed image. The processor includes: a cable driver that applies a voltage higher than an input voltage standard of the image pickup section so as to compensate for attenuation of a high-frequency signal caused by the cable and outputs a clock signal for driving the image pickup section a peaking circuit that performs waveform correction of the clock signal and a DC level limiting circuit configured to limit, when a clock signal inputted from the first peaking circuit is switched to a DC voltage, an amplitude level of the DC voltage so as not to exceed a level of the input voltage standard of the image pickup section.
