A light source device capable of giving a warning to a user according to an actual deterioration state of a light source is proposed. A light source device drives at least one light source, a light monitor unit for detecting emitted light emitted from the light source, and driving the light source so that a detection value detected by the light monitor unit shows a predetermined target value. A light source driving unit that controls current or applied voltage, and a primary warning when the driving current or applied voltage of the light source reaches a predetermined reference value. After the primary warning is performed, based on the deterioration level of the light source And a warning unit for performing predetermined processing. [Selection] Figure 4【課題】実際の光源の劣化状態に応じて、ユーザに対して警告を行うことが可能な光源装置を提案する。【解決手段】光源装置は、少なくとも１つの光源と、光源から出射される出射光を検出する光モニタ部と、光モニタ部により検出される検出値が所定の目標値を示すように光源の駆動電流又は印加電圧を制御する光源駆動部と、光源の駆動電流又は印加電圧が所定の基準値に到達したときに１次警告を行い、１次警告が行われた後、光源の劣化レベルに基づいて所定の処理を行う警告部と、を備える。【選択図】図４
