A fundus oculi observation device comprises: a first image forming part configured to form a 2-dimensional image of a surface of a fundus oculi of an eye a second image forming part configured to form a tomographic image having a cross-sectional position in a measurement region of the fundus oculi corresponding to a partial region of the 2-dimensional image a display a storage configured to store imaging condition information including characteristic information showing a characteristic of the eye and a controller configured to match display sizes of the formed 2-dimensional image and a measurement range image showing a range of the measurement region with each other, based on the stored imaging condition information, and cause the display to display the 2-dimensional image and the measurement range image whose display sizes are matched.
