A multi-view display device is provided, and the multi-view display device at least comprises a projector, a first lens set, and a second lens set. The projector contains a scan-lamp image, and the projector slants an incident ray corresponding to the scan-lamp image with a first angle. The first lens set receives the slanted incident ray and refracts that. The second lens set is slanted with the first angle, and the second lens set receives the slanted incident ray which is refracted by the first lens set and refracts that again, so as to expand a view area of the multi-view display device.