An endoscope system (1) comprises an insertion part (6) to be inserted into a subject, an observation window (8) provided in the insertion part (6) and acquiring a first object image from the front, An observation window (10) provided in the insertion part (6) for acquiring a second object image from the side different from the front side, an illumination window (7) for emitting the first illumination light in front, An illumination window (9) for emitting a second illumination light to the side, a first illumination light (7) in the illumination window (7) based on a signal for detecting signals indicating the temperatures of the illumination windows (7) And a control unit (42) for individually and independently controlling the light quantity of the first illumination light of the illumination window (9) and the light quantity of the second illumination light of the illumination window (9).内視鏡システム(1)は、被検体の内部に挿入される挿入部(6)と、挿入部(6)に設けられ、前方から第1の被検体像を取得する観察窓(8)と、挿入部(6)に設けられ、前方とは異なる側方から第2の被検体像を取得する観察窓(10)と、前方に第1の照明光を出射する照明窓(7)と、側方に第2の照明光を出射する照明窓(9)と、照明窓(7)と(9)の温度を示す信号を検出する信号に基づき、照明窓(7)の第1の照明光の光量と照明窓(9)の第2の照明光の光量とを個々に独立して制御する制御部(42)と、を備える。
