Abstract: A toy wheeled vehicle with an inertia wheel having friction driven wheels, an inertia type flywheel, gear trains of a driving mechanism, and a sound generator which is provided coaxially with the flywheel. The driving mechanism includes two groups of gear trains, one is for the flywheel energizing mechanism through a clutch gear and a detachable floating gear and the other is for the rotation transmission mechanism from the energized flywheel to the friction driven wheels through the clutch gear and a stationary gear which is always engaged with the flywheel gear and is detachably engaged with the clutch gear. The energized flywheel which is detached from the floating gear and the wheels through the clutch gear continues to rotate when the wheels are stopped, and when the clutch gear is engaged with the stationary gear, the inertia rotation of the flywheel is transmitted to the wheels, and the sound generator produces the sound of a siren while the flywheel rotates.