An endoscope apparatus comprising: light source means configured to emit a first light which is one of normal observation light and excitation light for fluorescence observation to be irradiated to a subject and a second light which is the other of the normal observation light and the excitation light; a light amount control means (13, 14, 17) which is provided on a light path generated from the light source means and which is configured to control an amount of light passing through the light path; image pickup means (100a, 100b) configured to output a first image signal obtained by picking up an image of the subject irradiated with the first light whose amount is controlled by the light amount control means, and a second image pickup signal obtained by picking up an image of the subject irradiated with the second light; dimming signal generating means configured to output a first dimming signal so as to control the light amount control means in order to adjust the amount of light irradiated to the subject based on the first image pickup signal; wherein: the image pickup means is configured to output, as the second image pickup signal, an image pickup signal obtained by picking up an image with light from the subject irradiated with the second light whose amount of light is controlled by the light amount control means which is controlled by the first dimming signal, the dimming signal generating means is further configured to output a second dimming signal so as to adjust brightness of the second image pickup signal based on the second image pickup signal; and the endoscope apparatus further comprises a signal amplification means (32, 33) configured to amplify a signal intensity of the second image pickup signal picked up by the image pickup means based on the second dimming signal; or electronic shutter control means configured to control an electronic shutter which is configured to store charge and to discharge the charge in the image pickup means based on the second dimming signal. light source means configured to emit a first light which is one of normal observation light and excitation light for fluorescence observation to be irradiated to a subject and a second light which is the other of the normal observation light and the excitation light; a light amount control means (13, 14, 17) which is provided on a light path generated from the light source means and which is configured to control an amount of light passing through the light path; image pickup means (100a, 100b) configured to output a first image signal obtained by picking up an image of the subject irradiated with the first light whose amount is controlled by the light amount control means, and a second image pickup signal obtained by picking up an image of the subject irradiated with the second light; dimming signal generating means configured to output a first dimming signal so as to control the light amount control means in order to adjust the amount of light irradiated to the subject based on the first image pickup signal; the image pickup means is configured to output, as the second image pickup signal, an image pickup signal obtained by picking up an image with light from the subject irradiated with the second light whose amount of light is controlled by the light amount control means which is controlled by the first dimming signal, the dimming signal generating means is further configured to output a second dimming signal so as to adjust brightness of the second image pickup signal based on the second image pickup signal; and the endoscope apparatus further comprises a signal amplification means (32, 33) configured to amplify a signal intensity of the second image pickup signal picked up by the image pickup means based on the second dimming signal; or electronic shutter control means configured to control an electronic shutter which is configured to store charge and to discharge the charge in the image pickup means based on the second dimming signal.