PROBLEM TO BE SOLVED: To provide a light source device for an endoscope and an electronic endoscope system capable of acquiring a suitable image by making illumination light be incident on a light guide appropriately in accordance with the type of an endoscope.SOLUTION: The light source device for endoscope for supplying illumination light to the endoscope comprises: a light source for emitting the illumination light a condenser lens for focusing the illumination light emitted from the light source on the incident end face of the light guide of the endoscope and a lens moving unit for moving the condenser lens in parallel with an optical axis direction in accordance with the type of the endoscope.COPYRIGHT: (C)2015,JPO&INPIT【課題】内視鏡の種類に応じて照明光を適切にライトガイドに入射させることで、好適な画像を取得することが可能な内視鏡用光源装置および電子内視鏡システムを提供すること。【解決手段】内視鏡に照明光を供給する内視鏡用光源装置において、照明光を照射する光源と、光源から照射される照明光を内視鏡のライトガイドの入射端面に収束させる集光レンズと、内視鏡の種類に応じて、集光レンズを光軸方向と平行に移動させるレンズ移動部と、を備える構成とした。【選択図】図4