An endoscope system (10, 200, 300), comprising: a biometric feature amount calculation unit configured to calculate a biometric feature amount of an observation target using a plurality of biometric feature amount calculation images obtained by imaging the observation target with a plurality of illumination light beams having different wavelength ranges; an image acquisition unit configured to perform pre-imaging for obtaining a correction image obtained by imaging the observation target; a biometric feature amount correction amount calculation unit configured to calculate a biometric feature amount correction amount with respect to the biometric feature amount using the correction image; a biometric feature amount correction unit configured to correct the biometric feature amount calculated by the biometric feature amount calculation unit according to the biometric feature amount correction amount; a storage unit configured to store the correction image and a biometric feature amount image, which shows the biometric feature amount after correction, so as to be associated with each other, and a display unit (18, 48) that is adapted to display the correction image and the biometric feature amount image; wherein the storage unit is configured to store a plurality of sets of correction images by performing pre-imaging multiple times, and the endoscope system being configured to execute a verification mode in which in a case where the correction image used for calculation of the biometric feature amount correction amount by the biometric feature amount correction amount calculation unit is not appropriate, i.e., where the correction image has been acquired under not-appropriate imaging conditions, the biometric feature amount correction amount calculation unit is configured to calculate the biometric feature amount correction amount by changing a set of the correction images, and the biometric feature amount correction unit is configured to correct the biometric feature amount using the biometric feature amount correction amount calculated by changing a set of the correction images by the biometric feature amount correction amount calculation unit. a biometric feature amount calculation unit configured to calculate a biometric feature amount of an observation target using a plurality of biometric feature amount calculation images obtained by imaging the observation target with a plurality of illumination light beams having different wavelength ranges; an image acquisition unit configured to perform pre-imaging for obtaining a correction image obtained by imaging the observation target; a biometric feature amount correction amount calculation unit configured to calculate a biometric feature amount correction amount with respect to the biometric feature amount using the correction image; a biometric feature amount correction unit configured to correct the biometric feature amount calculated by the biometric feature amount calculation unit according to the biometric feature amount correction amount; a storage unit configured to store the correction image and a biometric feature amount image, which shows the biometric feature amount after correction, so as to be associated with each other, and a display unit (18, 48) that is adapted to display the correction image and the biometric feature amount image; wherein the storage unit is configured to store a plurality of sets of correction images by performing pre-imaging multiple times, and the endoscope system being configured to execute a verification mode in which in a case where the correction image used for calculation of the biometric feature amount correction amount by the biometric feature amount correction amount calculation unit is not appropriate, i.e., where the correction image has been acquired under not-appropriate imaging conditions, the biometric feature amount correction amount calculation unit is configured to calculate the biometric feature amount correction amount by changing a set of the correction images, and the biometric feature amount correction unit is configured to correct the biometric feature amount using the biometric feature amount correction amount calculated by changing a set of the correction images by the biometric feature amount correction amount calculation unit.