The light source device 3 includes a light source unit 13 in which a plurality of LEDs that emit illumination light in the same wavelength band are arranged, and light emitted from the light source unit 13 at the proximal end side input end of the light guide 4 of the endoscope 2. Based on the guiding optical system 14 and the endoscope information in the endoscope information storage unit 5, the LEDs 22 as the first light source group that makes the plurality of LEDs of the light source unit 13 enter the vicinity of the optical axis of the input end； Control is performed by separating the LED 23 as the second light source group around the LED 22 as the first light source group and dropping the output of the LED 23 as the second light source group from the output of the LED 22 as the first light source group. LED control unit 12.光源装置３は、同じ波長帯域の照明光を出射する複数のＬＥＤが配置された光源ユニット１３と、光源ユニット１３からの出射光を、内視鏡２のライトガイド４の基端側入力端に導く光学系１４と、内視鏡情報記憶部５の内視鏡情報に基づき、光源ユニット１３の複数のＬＥＤを、入力端の光軸の近辺に入射する第１の光源群としてのＬＥＤ２２と、第１の光源群としてのＬＥＤ２２の周囲の第２の光源群としてのＬＥＤ２３とに分別し、第２の光源群としてのＬＥＤ２３の出力を第１の光源群としてのＬＥＤ２２の出力より落とす制御を行うＬＥＤ制御部１２とを備える。
