An endoscope system (1) includes: an insertion portion (6) inserted into a subject an observation window (8) provided on the insertion portion (6) and configured to acquire a first subject image from a forward direction an observation window (10) provided on the insertion portion (6) and configured to acquire a second subject image from a lateral direction different from the forward direction an illumination window (7) configured to emit first illumination light in the forward direction an illumination window (9) configured to emit second illumination light in the lateral direction and a control section (42) configured to individually and independently control an amount of light of the first illumination light of the illumination window (7) and an amount of light of the second illumination light of the illumination window (9) based on signals for detecting signals indicating temperatures of the illumination windows (7) and (9).
