An information providing system of a motorcycle includes a navigation device and an audio device. The navigation device includes a navigation controller. The navigation controller is disposed in a trunk on a side surface of the trunk close to a back surface of a passenger seat. The trunk is provided in a rear portion of a vehicle body of the motorcycle and above a rear wheel of the motorcycle. The audio device includes an audio device operation part and an audio device controller. The audio device operation part is provided in a vicinity of a handlebar of the motorcycle. The audio device controller is disposed in an audio device housing provided at a position lower than a bottom plate of the trunk.