PERIPHERY MONITORING DEVICE

A peripheral monitoring device according to one embodiment includes an acquirer configured to acquire a first rear image of a vehicle at first timing, the vehicle including a first coupler device which couples a towed vehicle; and an image processing unit configured to superimpose first identification information on the first rear image at second timing being after the first timing, the first identification information representing a position of the first coupler device at the second timing, and to display, on a display screen, the first rear image on which the first identification information has been superimposed, the display screen configured to be installed in the vehicle.