A display such as a liquid crystal display unit, a light emitting diode assembly, or an electroluminescent element is arranged behind a front glass window of a mirror for indicating, for example, current time information or calculator output information. A switching means is provided for controlling the enabling and disabling of the display. The display section forms a part of the mirror when the display is not enabled. In a preferred form, a liquid crystal display unit of the reflection type is attached to the rear surface of the front glass window of the mirror. The reflection film of the liquid crystal display unit functions as a reflection film of the mirror when the display is disabled, thereby forming a continuous mirror assembly even at the display section. That is, there is no distinction between the display region and the normal mirror region.