Light beams from light sources 1, 2 are scanned by a galvano mirror 10a to illuminate a predetermined portion 15b of an object to be observed 15 via an objective lens 14. The reflected light from the object is re-scanned by the galvano mirror 10a to obtain a two-dimensional image via an image-capturing element 25. Measuring means composed of an OCT interferometer 32 is branched or coupled in the optical path between the objective lens 14 and the galvano mirror 10a to obtain a tomographic image of the object. In this configuration, the two-dimensional image and the tomographic image of the object can be displayed simultaneously on a display device 28.