A finder function of an imaging unit for taking an entire image including a cornea for transplantation displays a high-quality image. There are provided a support table for supporting an observation container containing a cornea for transplantation as an observed target, a specular optical system that includes a first light source and a first imaging unit, and includes an illuminating optical system and an imaging optical system for acquiring and observing a magnified image of a cornea for transplantation from above or below the observation container in the vertical direction by specular reflection, a second imaging unit for taking an entire image including a region in which the cornea for transplantation is contained from above or below the observation container in the vertical direction, and a switch for selectively switching between the first imaging unit and the second imaging unit to acquire the magnified image and the entire image.
