An electronic endoscope system includes a light source that emits light including at least a visible light region and a transmission peak at at least one specific wavelength in a continuous wavelength region including at least a visible light region, and the continuous wavelength An optical filter having a transmittance distribution higher than 0 and lower than a half value of the transmission peak over the entire region other than the transmission peak in the region, and an optical for inserting or retracting the optical filter with respect to the irradiation optical path of the light source Filter switching means, a color solid-state image sensor that receives reflected light from an object irradiated by irradiation light with or without an optical filter, and an image signal output from the solid-state image sensor can be processed and displayed on a monitor And image generation means for generating a color image.電子内視鏡システムを、少なくとも可視光領域を含む光を放射する光源と、少なくとも可視光領域を含む連続的な波長域中の少なくとも１つの特定波長に透過ピークを持つと共に、該連続的な波長域中の該透過ピーク以外の全域に亘って０よりも高くかつ該透過ピークの半値よりも低い透過率分布を持つ光学フィルタと、光源の照射光路に対して光学フィルタを挿入し又は退避させる光学フィルタ切替手段と、光学フィルタを介した又は介さない照射光によって照射された被写体からの反射光を受光するカラーの固体撮像素子と、固体撮像素子が出力する撮像信号を処理してモニタ表示可能なカラー画像を生成する画像生成手段と、から構成した。
