One embodiment according to the technique of the present disclosure provides a projection device having a plurality of modes in which relationships between an incidence region and an emission region in an electro-optical panel are different from each other. In the projection device according to one aspect of the present invention, a control unit controls a first mode and a second mode. The first mode is a mode in which a first range of an optical region is the incidence region and a range within the first range is the emission region, and the second mode is a mode in which a second range narrower than the first range of the optical region is the incidence region and a range within the second range is the emission region.