An endoscope system comprising: an imaging condition determination unit including a reference imaging condition storage unit that stores a reference imaging condition for obtaining a predetermined reference image for each examination region; the endoscope system further comprising: an image acquisition unit that images the examination region to acquire an examination image in order to obtain a reference-equivalent image equivalent to the reference image; an at-examination imaging condition acquisition unit that acquires an at-examination imaging condition obtained at an acquisition timing of the examination image; a still image saving request signal output unit that outputs a still image saving request signal for requesting saving of a still image of the examination image; and a display unit that displays the examination image, characterized in that: the imaging condition determination unit is configured to determine whether or not the at-examination imaging condition satisfies the reference imaging condition for obtaining a reference image, such that in a case where the at-examination imaging condition satisfies the reference imaging condition the still image saving request signal output unit outputs a still image saving request signal, which requests the saving of the still image of the examination image. an imaging condition determination unit including a reference imaging condition storage unit that stores a reference imaging condition for obtaining a predetermined reference image for each examination region; the endoscope system further comprising: an image acquisition unit that images the examination region to acquire an examination image in order to obtain a reference-equivalent image equivalent to the reference image; an at-examination imaging condition acquisition unit that acquires an at-examination imaging condition obtained at an acquisition timing of the examination image; a still image saving request signal output unit that outputs a still image saving request signal for requesting saving of a still image of the examination image; and a display unit that displays the examination image, characterized in that: the imaging condition determination unit is configured to determine whether or not the at-examination imaging condition satisfies the reference imaging condition for obtaining a reference image, such that in a case where the at-examination imaging condition satisfies the reference imaging condition the still image saving request signal output unit outputs a still image saving request signal, which requests the saving of the still image of the examination image. an image acquisition unit that images the examination region to acquire an examination image in order to obtain a reference-equivalent image equivalent to the reference image; an at-examination imaging condition acquisition unit that acquires an at-examination imaging condition obtained at an acquisition timing of the examination image; a still image saving request signal output unit that outputs a still image saving request signal for requesting saving of a still image of the examination image; and a display unit that displays the examination image, characterized in that: the imaging condition determination unit is configured to determine whether or not the at-examination imaging condition satisfies the reference imaging condition for obtaining a reference image, such that in a case where the at-examination imaging condition satisfies the reference imaging condition the still image saving request signal output unit outputs a still image saving request signal, which requests the saving of the still image of the examination image.