1. A microscope comprising: dark field illumination and bright field illumination which illuminate a preparat where a sample mounted on a slide glass is covered with a cover glass and a mounting agent; an image capturing unit which acquires a dark field image by image-capturing the preparat illuminated by the dark field illumination and which acquires a bright field image by image-capturing the preparat illuminated by the bright field illumination; and a magnified portion image acquisition area determination unit which detects a mounting agent oozing area of the cover glass in the preparat based on the dark field image and the bright field image acquired by the image capturing unit and determines an internal area of the detected mounting agent oozing area as a magnified portion image acquisition area of the sample; and wherein the magnified portion image acquisition area determination unit calculates a position of the mounting agent oozing area, which indicates the dark field image, and determines the entire surface of an internal area at a position in the bright field image corresponding to the position of the mounting agent oozing area, which is calculated from the dark field image, as the magnified portion image acquisition area.