The endoscope system passes through a first light source unit that generates first and second narrowband light simultaneously or alternately, a color filter in which first and second filters having different spectral characteristics are arranged, and a first filter. An image sensor capable of receiving the received light by the first pixel group, receiving the light having passed through the second filter by the second pixel group, and setting an exposure period and an electrical signal readout period for each pixel； When the first and second narrowband lights are alternately generated from the light source unit, the first narrowband light generation period, the first pixel group exposure period, and the second pixel group readout period are generated. Are synchronized in the first period, and the generation period of the second narrowband light, the exposure period of the second pixel group, and the readout period of the first pixel group are synchronized in the second period. A control unit.内視鏡システムは、第１及び第２の狭帯域光を同時にまたは交互に発生する光源部と、分光特性が異なる第１及び第２のフィルタを配置したカラーフィルタと、第１のフィルタを通過した光を第１の画素群で受光し、第２のフィルタを通過した光を第２の画素群で受光するとともに、露光期間及び電気信号の読出期間を各画素毎に設定可能な撮像素子と、第１及び第２の狭帯域光を光源部から交互に発生させる際に、第１の狭帯域光の発生期間と、第１の画素群の露光期間と、第２の画素群の読出期間と、を第１の期間において同期させるとともに、第２の狭帯域光の発生期間と、第２の画素群の露光期間と、第１の画素群の読出期間と、を第２の期間において同期させる制御部と、を有する。
