The present invention provides a mirror display that has improved design aesthetics and makes it possible to sufficiently improve visibility in mirror mode in dark environments. The mirror display according to the present invention includes a half mirror plate having a half mirror layer, a display device, a case, and an auxiliary illumination unit that includes an auxiliary light source. The case supports at least the half mirror plate and the display device and includes an outer frame that covers an edge of a front surface of the half mirror plate when viewed in a plan view from a viewing side. The display device is arranged on a rear side of the half mirror plate. The auxiliary light source is arranged on the rear side of the half mirror plate, the display device, or the outer frame. The auxiliary illumination unit is controlled separately from the display device and emits light towards the viewing side when the mirror display is in mirror mode. As measured on the viewing side, a brightness of the light emitted from the auxiliary illumination unit is greater than a brightness of the display device when the display device is in a white display state.