A light emission driving device sequentially on a time division basis drives a red light source (200R), a green light source (200G), and a blue light source (200B), to calculate a light emission amount control parameter (PWM(k+1)) for setting the light emission amount for one of the light sources. The following values are used: a detected light emission amount (DET(k)) detected for a previous illumination of the same light source, a predetermined value (REF(k+1)) for comparison to the detected light emission amount (DET(k)), and the light emission amount control parameters (PWM(k)) for a previous illumination of the same light source.