An imaging apparatus comprising: an imaging unit that is able to image, in a time series order, each of a first biological sample having undergone a first process and a second biological sample which has undergone a second process which is a comparison target with the first process and is different from the first process, wherein the second biological sample is of the same type as the first biological sample; and an imaging interval setting portion that is able (i) to acquire a plurality of first images obtained by imaging the first biological sample, and a plurality of second images obtained by imaging the second biological sample at the same timing as a timing of the first image, whereby an imaging interval between first images and between second images is the same, and (ii) to set the imaging interval of the first biological sample and the second biological sample on the basis of a difference between feature data of the first image and feature data of the second image or a change amount of the difference, wherein the imaging unit is able to image the first biological sample and the second biological sample by using the imaging interval set by the imaging interval setting portion; wherein the imaging interval setting portion sets an imaging interval after a first imaging time point of the first image and the second image to be shorter than an imaging interval related to the first imaging time point in a case where a difference between the feature data of the first image and the feature data of the second image or a change amount of the difference is equal to or more than a preset first threshold value (Th3; Th5); and wherein the imaging interval setting portion sets an imaging interval after a second imaging time point, later than the first imaging time point, of the first image and the second image to be longer than an imaging interval related to the second imaging time point in a case where a difference between the feature data of the first image and the feature data of the second image or a change amount of the difference is equal to or less than a preset second threshold value (Th4; Th6). an imaging unit that is able to image, in a time series order, each of a first biological sample having undergone a first process and a second biological sample which has undergone a second process which is a comparison target with the first process and is different from the first process, wherein the second biological sample is of the same type as the first biological sample; and an imaging interval setting portion that is able (i) to acquire a plurality of first images obtained by imaging the first biological sample, and a plurality of second images obtained by imaging the second biological sample at the same timing as a timing of the first image, whereby an imaging interval between first images and between second images is the same, and (ii) to set the imaging interval of the first biological sample and the second biological sample on the basis of a difference between feature data of the first image and feature data of the second image or a change amount of the difference, wherein the imaging unit is able to image the first biological sample and the second biological sample by using the imaging interval set by the imaging interval setting portion; wherein the imaging interval setting portion sets an imaging interval after a first imaging time point of the first image and the second image to be shorter than an imaging interval related to the first imaging time point in a case where a difference between the feature data of the first image and the feature data of the second image or a change amount of the difference is equal to or more than a preset first threshold value (Th3; Th5); and wherein the imaging interval setting portion sets an imaging interval after a second imaging time point, later than the first imaging time point, of the first image and the second image to be longer than an imaging interval related to the second imaging time point in a case where a difference between the feature data of the first image and the feature data of the second image or a change amount of the difference is equal to or less than a preset second threshold value (Th4; Th6).