In recent years, there is a study about a vehicle, as disclosed in below-identified Patent Document 1, which has a single front wheel disposed in a front portion of the vehicle and right and left wheels disposed in respective right and left portions of the vehicle and located on a rear side of the front wheel. Further, there is a study about a vehicle, as disclosed in below-identified Patent Document 2, which has, in addition to the front wheel and right and left wheels, a single wheel disposed in a rear portion of the vehicle, namely, a vehicle in which four wheels are arranged in a diamond-shaped arrangement.