One embodiment of the present invention is an endoscope system including an illumination unit, a color component ratio measurement unit, and a light amount ratio adjustment unit. The illumination unit sequentially or simultaneously irradiates the object to be observed with a plurality of narrowband lights having different wavelengths and capable of controlling the light amount independently of each other as illumination light. The color component ratio measurement unit measures the color component ratio of the illumination light. The light amount ratio adjustment unit adjusts the light amount ratio of the narrowband light based on the output from the color component ratio measurement unit, and corrects the illumination light to have a desired color. Moreover, one embodiment of the present invention is an endoscope light source device including a light source unit, a color component ratio measuring unit, and a light amount ratio adjusting unit.本発明の一実施形態は、照明部と、色成分比測定部と、光量比調整部とを具備する内視鏡システムである。照明部は、互いに異なる波長を有し、かつ、互いに独立して光量の制御が可能な複数の狭帯域光を照明光として被観察体に順次又は同時に照射する。色成分比測定部は、照明光の色成分比を測定する。光量比調整部は、色成分比測定部からの出力に基づいて狭帯域光の光量比を調整し、照明光が所望の色となるように補正をする。また、本発明の一実施形態は、光源部と、色成分比測定部と、光量比調整部とを具備する内視鏡用光源装置である。
