An endoscope system (1) includes a light source device (3) in which a control section (21) controls an LED driving section (22) to supply driving currents to LEDs (23r, 23g, 23b, and 23v) of a plurality of colors, a scope (2) that radiates illumination light and captures an optical image of a subject, a CCD (13) that picks up an optical image of the subject, and a video processor (4) that processes an image and sets, on the basis of ratios for each of respective colors of respective maximum light emission intensities of the respective LEDs and color balance values of respective color lights, maximum light emission periods of the respective LEDs in one frame period of frame-sequential lighting. The control section (21) controls the LED driving section (22) such that lights are emitted from the respective LEDs in a frame-sequential manner in light emission periods in the maximum light emission periods.
