To provide a display device, a vehicle-mounted display device, and an electronic device whose chassis are not large with much design freedom. In the present invention, a plurality of light-emitting elements each having a luminescent material sandwiched between a pair of electrodes having transparency, a plurality of liquid crystal elements each having a liquid crystal material sandwiched between a pair of electrodes having transparency are arranged in a display device over a substrate having a mirror surface. Further, a plurality of light-emitting elements each having a luminescent material sandwiched between a pair of electrodes having transparency, a plurality of liquid crystal elements each having a liquid crystal material sandwiched between a pair of electrodes having transparency are arranged in a display device over a substrate having a reflecting surface. The display device is secured to the substrate with a barrier film therebetween.