In an endoscope system 1 according to the present invention, a processing device 4 processes a pixel signal of a plurality of pixels that is configured to receive light from a subject illuminated with pulsed light and to perform photoelectric conversion on the received light to generate the pixel signal. The processing device 4 includes an image processing unit 45 that generates an illumination time pixel signal corresponding to a pixel signal generated when the plurality of pixels is exposed in an illumination timing of pulsed light from a light source 51, from the pixel signal of the plurality of pixels that has received the light from the subject illuminated with the pulsed light, the pixel signal has been read by a reading unit 243, according to an overlapping state between the illumination timing of the pulsed light from the light source 51 and read timing of the pixel signal read by the reading unit 243.
