Abstract: A half mirror device includes a panel, and at least one light source disposed on a back side of the panel to emit light. The panel includes a light-transmitting base layer, a mirror layer formed on a front surface of the base layer to reflect light, the mirror layer having a plurality of light-transmitting holes at regular intervals through opposite surfaces of the mirror layer in a thickness direction, and a light-transmitting protective layer formed on a front surface of the mirror layer to protect the mirror layer, wherein the light source transmits light through the light-transmitting holes of the mirror layer.