To prevent jumping-out of a model car from a rail in the curve by installing a magnet in a bottom part or a side part of the rail, and installing a magnet material piece in a bottom part or a side part of the model car.

A fixed magnet 101 is disposed on a bottom surface of a rail 10. While, an iron piece 201 being a ferromagnetic material is installed on a bottom surface of a model car 20. This is put in the opposed positional relationship such as magnetic force efficiently acts on the iron piece 201 when the model car 20 comes onto the fixed magnet 101. In this constitution, when the model car 20 comes to an installing place of the fixed magnet 101, the iron piece 210 receives stopping force by being influenced by the fixed magnet 101. Then, traveling inertia force is offset so as to reduce a speed. Therefore, jumping-out in the curve can be prevented so as to prevent unnatural race form such as returning the model car 20 to the rail 10 by hand.