Abstract: This invention provides a stop mechanism capable of stopping a model car under a spin-turn state. A seesaw-shaped swing member 22 is mounted to a car body 11 of a model car 10 at a position deviated either to the right or left from a centerline of the car body 11 in a driving direction. An axle 21 of driving rear wheels 13 supports the swing member 22 and allows it to swing. A driving motor 20 is fitted to rear side of the swing member and a stopper plate 23, to the front side. A spring 25 for always biasing the swing member in a direction in which the stopper plate of the swing member comes into touch with a road surface 30 is interposed between the swing member and the car body. An intermeshing gear is arranged in such a fashion that a direction of reaction force transmitted from the driving rear wheels to the driving motor operates in a direction in which the stopper plate is separated from the road surface against the biasing force of the spring when the driving motor is rotated for advance.