To provide a model device allowing a user to watch a picture from a model rolling stock 2 continuously on a monitor 23 even if the model rolling stock 2 is running in a place surrounded by shields.

The model device is structured so that a track 3 to be a conductive rail for guiding the running of the model rolling stock 2 and feeding the driving power 4 to a driving motor 7 is used as a transmission passage for transmitting image signals from the model rolling stock 2 side to the monitor 23 side. Accordingly, if an electromagnetic shield is present near the model rolling stock 2 running, pictures can be continuously displayed on the monitor 23.