A mobile terminal device including a camera for imaging the person to be photographed and a flexible and foldable display is provided with a line of sight detection unit for detecting a line of sight of the person to be photographed. Here, when photographing in the state where the mobile terminal device is folded, the mobile terminal device displays a mirror image on the display part on the side of the person to be photographed when it has been identified that the line of sight direction of the person to be photographed detected by the line of sight detection unit is directed to the display part on the side of the person to be photographed, the camera, or at least the mobile terminal device itself.